Liking "girls' toys" like barbies and dresses when you were little, which is a true in my case growing up even though I pretty much played with anything I could get my hands on. Even when I was a kid I didn't give a fuck about gender roles.
Being sentimental and compassionate. Real men only have two emotions: barely contained rage and horny, so any emotional depth is a clear sign on being more in touch with your feminine side, which means that you like dick. Obvious machismo bullshit unless if your life goal is being a sex robot. This leads into the stigma on having many women as friends and (shocker) viewing them as something more than living sex dolls. I guess seeing a woman as a person first with a personality and ideas means you're not into them. Now this one I think is pretty accurate; gay guys for some reason manage to click into things like girl talk, sleep overs, and girls' night out more so than straight dudes, kind of like how tomboys are part of a lot of "guy things" like watching wrestling or drinking beer on the porch. I myself pretty much only had girl friends growing up, but once I got hit with the puberty bat I became both homosexual and homosocial which is probably one of the worst combinations to ever have.
Having a lisp and/or a soft voice. Probably true with how testosterone plays a role in sexuality since your cords may not get enough exposure to masculinize them. My own voice has been described as being deep and loud but also gentle, so I guess it's bicurious or homoflexible.
Being good at anything other than sports or hating sports and guns. There are literally people who think anyone that likes anything other than shooting targets or hoops, also likes taking it from behind....which is odd since I like it all. Both gay guys and dude bros love playing with balls, shooting hot loads, and smacking man-ass after all, and that's why I'll never get this stereotype. Lots of gay guys tend to have a wider perspective on what it means being a man since gendered behavior is tied to gender roles which don't really apply to two dudes, but masculinity is something that we're attracted to and try to have. I just don't believe in being a douche that can't take "No thanks." for an answer.
Having some sense of taste or appreciation when it comes to food, art, music, clothes, dance etc. If your idea of a good meal is anything more than microwaved meat with cheap beer, you clearly like the other kind of hot meat. There does seem to be an element of refinement in a lot of gay culture and artists have always been more open to queerness for some reason. Since gay people tend to congregate in cities to get a more open environment and a larger dating pool, the wider exposure to other cultures is inevitable. I like things like wine, cuisine, art, and going to museums, but that's got more to do with being raised by parents that are into those things than being into dudes.
Liking pop music of any kind, and this one has been a good indicator in my experience since pop has such a massive presence in gay pride, which is also one of the reasons I could never really get into it.
Being a liberal and/or atheist.....which makes plenty of sense when you consider how conservative ideology and most religions are when it comes to anything outside the status quo in general.