If it's a girl I know irl, like my girlfriend or something, it's "lol, Let's run it back." Especially in Street Fighter 3rd Strike, which is our game. Then I'm like "NO FUCK THAT RUN THAT SHIT BACK." Heated friendly competition.
If it's a girl I don't know irl, like some random on XBL or something, it's "lol, Let's run it back." Especially in something like Skullgirls, which I like a lot so it's hard to take that L lying down from anyone.
I don't really feel anything about gender, but if it's a fighting game, I don't want to lose, period. Same with puzzle games like Puzzlegeddon. If I lose in a shooter, then I just lol, because I'm horrible at shooters anyways.
But I never really understood guys getting upset when girls beat them in games. At EVO especially, dudes were like "OH IF YOU GET BODIED BY THIS CHICK YOU'RE A ***** BRO," and all that tired sexist shit. She put in the work, she takes your ass out, that's the end of it. Gender and shit doesn't really have a place in the practice it takes to stick Painwheel unfly combos or any of I-no's combos or hitting one frame links (or any of that stuff) consistently during a major.