That's actually interesting because in my experience more of the trans men I know/see, whether it be on social media or otherwise, are straight. I actually have yet to see more gay/bi trans men than straight trans guys - the number of straight trans men I see usually outweigh the gay/bi trans men. That's in the general public though, and tends to be with trans men who are more public and out there in various forms of media. In some other LGBT+ groups/areas that I know, it tends to be more balanced between straight and non-straight trans guys, or there may be more non-straight trans men. So I think it might depend on where you're looking? It's curious that we have different experiences regarding this though. I'll stop rambling on about this, I think at the end of the day it generally depends on the place and context.
Anyways, I think dating life is bound to be a bit harder if you're trans, and it upsets me sometimes and is also a pretty big area of insecurity for me, but I guess it's sort of the truth. I do know it's not a breeze being a trans men interested in men, either, even if only based off of things I read and experiences I hear about. I really don't know if there's a difference between how accepting cis women are and how accepting cis men are to dating trans men. I do know that there are cis men out there who are quite adverse to dating trans men though

But I also know of cis men and women who are very open to dating trans people, and trans men who are in long term relationships with cis women. It usually depends on the individual, there are accepting people (but also the less accepting ones) in all circles.
I'm sorry to hear about your bad experiences though

You're not less of a man in any way, but I know that those kinds of rejections really, really string. I hope you find someone who's more accepting and loves and respects you for who you are soon.