No, but we're socially constructed to believe that EVERYTHING IS GAY. Men can't even hug, men can't even kiss or show their sons affection, men can't cry, men can't do/say anything without "no homo" being thrown out.
If you can say or call another guy too ugly for a girl then you can obviously acknowledge when another man is attractive. Doesn't mean you're sexually attracted to them and you wanna have butt sex.