Would it be possible that someone can actually reply to a post but not be insulting to the original post? If you don't think the athlete is gay, then say 'Nope, he's not gay because...." or not respond to the post at all.
If you think the question is dumb, leave it alone.
I advice that when you write a response, think of it that they are actually right in front of you.
Calling someone else's opinion "dumb" is just mean.