Guys poking fun at each other weak points is nothing new to me. Most of my guy friends, if not all, act just like that. I am a sensitive person and do not like taking things too far when I joke with other people or when people joke with me. I never thought my guy friends were bad, I just thought that was one kind of friend out of many. Girls usually do the same thing but they tend not to go as far as guys do with joking. I do not think there is a problem among guys joking the way they do. If you do not like that type of friend why not look for the type that you like. There is nothing wrong with looking for a guy who is softer and cares about other people feelings and emotion. Quite frankly, I probably would had felt just like you did if it happen to me, but that is usually the treatment that I get with my guy friends. That is why I like girl (friends) more because they are more considerate like you (not to say that you cannot find guys that are like that too). It might also explain why I did not have many friends growing up. They would always look at me and tell me what's wrong, but I never said anything because like people here said previously, that is how guys act. Well most of them. Being a transsexual let you see differences on how guys and girls treat each other.
What I find interesting is how both male and female friends treat each other. You just witness how MOST guys treat each other. Also there is a difference between how two girls, one girl and one boy, and two boys treat each other. I'll talk about my experiance with the girl/boy relationship with me being the boy since that interest me more:
I made a small joke with a girl (friend) that probably would not be a big deal with a guy. It was a funny joke that was not serious at all (It was a stupid joke). Me personally, I never take things too far, even with my guy friends and they always took advantage of that. However, with this girl (friend) she wanted an apology and I thought that was radiculous. So, afterward I did apologize, but I seen this joke told a dozen of times with two girl friends. What is more even funny was that this same joke was told to this same girl (friend) of mine by other girls. Also it was not a joke that only two girls can tell each other (it was a really stupid joke), pretty much boys or girls can tell this joke to each other. Jokes coming from friends (boys) to (girls) are usually, taken more personally no matter what type of joke it is. The fact that she took it more personally made me felt like she labeled me more as a guy which cause me gender dysphoria.
The fact that you get treated like that with your friend(s) (guy) just means that they accept you as one of them. Sure, you may not like the way they treat you (neither did I), but if you tell him about you feelings getting hurt, he will laugh (if he is anything like my guy friends). I never knew why I stay with my friends... It could had been because I was lonely and like the story I told with the girl (friend) I would had not belong in her friend list anyway.
Having my feeling and emotions not cared for with my guy friends (I will say one more time, that is how guys act with each other) and having to be extra careful not to step on someone toe with my girl (friends) really makes me feel gender dysphoric.
Just like me, you have to accept that guys act like that and deal with it or move on to other friends. The only reason I stayed was because I had no one to turn to. Take the beatings or find the type of friend that you like. That is how most male or female operate in society when in a friendship with the same or different gender. Unless they are breaking the status quo. In other words a guy is soft with another guy and hard on a girl duing a joke when in a friendship. As for girls they can go as hard or soft as they want with guys, but never go too far with other girls.
Have you ever thought how a guy would look if he was crying over his emotions being hurt or the other guy being too soft while he told a joke (that definitely did with me with my guy friends). Unfortunately, in 2013 men freedom of expression is still restricted and you just experiance just that. If only feminist can see what you just saw then they would take men's rights more seriously. If I was seen as a girl I can treat a guy as rough as I wanted and he would not dare bite back (never would because I am a sensitive person). And if he did he would have to apologize like I did. I felt like I was licking her invisible balls and penis treating her like a queen, while the guys were letting me have it. Women in some ways are more progressive and men are restricted. Of course, you must have known that guys treated each other like this before you thought of transitioning right???
As a guy I cannot find any suitable relationship with a guy or girl (because of society) and it is rare to find a guy who is caring or a girl that treat you as one of her friends. My transsexualism lead me to be lonely, depress, and sad..... I hope this does not happen to you. Although having friends have nothing to do with how you view yourself as a boy or girl, it does effect what friends you get most of the time.
I hope that by transitioning that I get the friends that I look for, if they still see me as a guy (don' pass) i'll be okay because at least am myself. I rather be a lonely ugly girl then have the type of relationship that you described. Good luck in your search for friendship.