@Kestrel ugh, I hate being let down like that. These days, every time I like something a dude has done/created I have that nagging "you are probably going to regret enjoying this" feeling. Women are not immune, of course, but...
The thing about 'sexist behavior' - or racist, or whatever - is that it's so rarely a binary. I know several men I've had to bring around in my actual life who seemed to think sexist men were these mustache twirling goons who couldn't stop themselves from making comments like GET IN THE KITCHEN AND SUCK MY DICK every time they so much as saw a woman. It's so rarely like that. These biases and entitlements are deep seated and strongly conditioned, and often you don't even see them until you knock that person off-canter. You don't see that a man is sexist until a woman challenges him/has some kind of control over an aspect of his life.
RP is so emotionally charged, and SO full of wish fulfillment. You see sexism coming out of people around rp because almost no one gracefully accepts having their fun/power fantasy affected by someone else. I am an ethical, thoughtful, and compassionate person, and I get bent out of shape emotionally about rp.