This is a good question. I feel like it's one of the more "dangerous" areas for the newly passing. You likely have not been socialized enough as a boy/man and specifically as a GAY boy/man to implicitly understand the nuances of showing your gayness in public.
Personally, I am a bit like Kyril in that I'm NOT visibly gay. Alone, no one has any reason to think I am gay. I feel the effects of the closet and how heterosexuality is the dominant norm every time I have to choose whether to disclose I am gay or not. This is no different from what other gay men experience. People think you are either in or out of the closet. It's not that simple. I am out in my life. But strangers and society do not know I am gay, and they do not assume I am gay when I'm alone unless I am in a gay-specific space. I was chatting with a guy I met via sports stuff yesterday, and he was talking about his fiancee or upcoming travel plans. I had to decide whether to use the "we" or the "I" about some of my upcoming life stuff. I chose not to and shared less. Maybe if I get to know him better, I would. I imagine this gets easier over time, but my cis gay friends suggest it is always THERE.
As for having a partner or boyfriend, while I was never much of a PDA kind of guy, even pre-transition, I am far more aware now - and careful - about anything that shows intimacy between me and my partner. I think it was a little bit harder for him than for me, not because he cares that people see him as half a gay couple, but the opposite: he was more prone to showing signs of closeness or connection and cares so little that he wasn't really THINKING about how he'd be viewed and whether our context was an appropriate place for displaying that. We've talked though, and we've developed a comfort in just being ourselves, even if we're not always approaching it the same way (e.g., he wears a ring on his right hand, after wearing mine on my right hand for a bit, I haven't worn mine in a while, because I was self-conscious about it & feared losing it if I was always taking it on and off).
We travel a fair amount. Since transitioning to being a visibly gay couple, we are WAY more deliberate in choosing "gay friendly" destinations or options. We err on the side of caution in general in public, though. That said: we don't really have to lie or anything. We are both masculine and don't "seem" gay to anyone, to the point where someone asked our connection at a sporting event we were attending & didn't BELIEVE we were "together." [I think he thought we were brothers and hiding it for some reason - I have no idea.] It's just that if we WANT to go the beach together or hang out and *relax,* we'll be more comfortable in a place where there are plenty of gays.
Otherwise, I do fear physical violence or bashing more than I used to. Someone who was going to target a woman as a victim was never going to pick ME. As a guy, though, I may seem an easier target. I look younger than I am. I am smaller than the average dude. I do have some sport-oriented fighting skills and carry myself with confidence that doesn't project target, but I still worry occasionally that I don't LOOK big or tough enough, genetically. I know guys who are BIG and teddy bears, but other people don't know that about them, and it's easier for them to just avoid being targeted. While I intend to improve my fitness and do some cross-over street fighting practice/training, I think that is really more for my attitude and confidence. Vigilance, good judgment and confidence are just going to have to prevail, since getting bashed isn't usually a fair one on one fight anyway.