Back in the days when MMOs were newer - girls had to be really careful. Not so much of guys, but other women. I still get mad over the hate that went on when you would party up with someone's boyfriend. My sister once got suspended from a game because she and a guy grouped up to do something in FFXI, and his girlfriend got really pissed (at my sister, not her boyfriend), that the lodged a complaint and somehow mods told my sister she had to stay away from the guy and suspended her for a while. Was nuts.
I got kicked out of a guild once for being friendly, too. (In WoW) Friendly with everyone. And lending money or items to people. I lent them to the wrong person, I guess.
Also in FFXI (ah, good times), I had a levelling partner that was a guy, but a guildmate decided she liked him, so she started logging in when I was at school or work and levelling up with him so he outlevelled me, and then started sending the guild/linkshell pictures of herself working at Hooters (and she ended up getting a bunch of gear from people). I called her an attention whore and got removed from the shell as well. Thankfully a bunch of people left with me, but still. This was 10 years or so ago, so I was young and stupid, too.
... This is ontop of the usual hate you get from people when you beat them in PVP or have better gear than them and such.
Really - being a girl in early online times was not easy. I used to get shit from guys all the way back in Asheron's Call because I played a girl character, too. I also got free stuff, though. And I took it, gladly, because they were dumb enough to give it to me.
Edit: I remembered that the one who hated my sister would often send her long letters explaining why my sister was stupid and shouldn't be playing the game. I got one rambly one from my issue...person as well explaining how she'd stolen my levelling partner from me and how they were now internet dating and I should stay away from them. ... Thankfully, I did.