am I a troll?

I just did something I rarely do on Facebook: called someone out for sexism. Here's a news flash: if you compare a male athlete's poor performance to playing like a girl, you're being sexist. You're trying to say that women are worse athletes. People say this who would never, presumably, say that an athlete played like someone of a different race.
I might be unfriended for this, I might get angry responses. I don't think I deserve anger: seriously, if you don't want to get called for being sexist, don't post sexist things on Facebook. But I'm tired of going on Facebook and seeing people be stupid.