Yes, I honestly think that it even makes guys who don't act the "gay" part feel very isolated and strange. In most cases I'd say it causes them to repress it and stay straight.
I can say that from experience. I'm a guy who likes hunting, dirt bike riding, having guy friends, and a country guy. Then I have a strong 100 percent attraction to men.. and like I felt like a weirdo/outsider. It's been nearly impossible to come out, because it's like it gets dropped or dismissed then people ask why you don't have a girlfriend. -.- (It might seem weird, but I'd say it's more common than thought.)
So it also hurts a lot of gay guys as well. Because of idiot men f*cking floating around and being retards reinforcing stereotypes. Sorry, but it's true.
edit - You might say they're "being themselves", but actually I think the guys who don't have a high voice and have limp wrists feel like they're doing something wrong, or they're not really "gay"...
They're the ones going through the most hell, and get the weirdest looks if they say they're gay. Being themselves psssh... the f*ck ever.
I'm not mad at them, but maybe I don't understand they were actually born that way. I can't exactly understand how you could be born to love shopping, Gaga, and glitter. I'm sorry, but you're a product of your environment and your disposition to the influence of others being gay and insecure with your sexuality so you relate more with women. You can relate more to women as in being insecure. That's why gay men love Liza, Gaga, Britney, and women who are strong, they want to be strong but they can't relate to men... yeah you get my point.