There's a difference between a man playing a female character and a man roleplaying a female character.
I imagine the OP thought all avatars had the same gender as the person playing them, the same way he assumes they all have the same hair color, hair style, ethnicity, age, etc.
After meeting an attractive female avatar in the game, he felt the blood rushing away from his brain, and it was love at first sight. He drove at top speed across the city, back to his garage, to get the custom Adder he'd purchased with the millions he'd been glitching at LSC all week. He knew that if that didn't impress her, nothing would. He took it back to where she was, pulling up alongside her, and honked his $15000 musical horn. He could feel the sweat streaming down from his greasy hair and soaking the XXL Snuggie plastered tightly across his back, not knowing how she would react.
She looked at him, with those beautiful pixels shaped like female eyeballs, and his cholesterol-laden heart skipped a beat. And then, the unthinkable happened: she got into the passenger seat. His jaw hit the floor, fully exposing the rotting yellow remnants of what used to be teeth in his mouth. He had never been this close to a female before, everything was moving so fast. He could already hear the wedding bells in their future. But before that, there was one last hurdle he had to overcome. He knew he would have to summon his massive courage and somehow actually talk to a girl.
His hands shaking, he opened up her gamer profile, and sent her an invite to chat. This was it, the greatest milestone of his entire life. He audibly gasped when she accepted, his head spinning with the euphoria that had overcome him. And then, in a pretty normal sounding guy's voice, she said "Hey, what's up?"
He couldn't believe it! This cross-dressing tranny had led him on, maliciously played with his heart, and then gleeful crushed it in their hand. He felt so ill that he threw up in his mouth, but realizing it still tasted a little like cheetos and mountain dew, he swallowed it back down easily. However, his rage at being deceived could not be controlled. In the game, he immediately got out of his Adder, dropped a grenade next to it, and ran away. That was just the beginning, though.
He exited GTA Online quickly so that wretched scummy pervert couldn't kill him back, and threw his controller against the wall before waddling as fast as he could to his mom's computer. He opened up the browser, went straight to the forums, and spent the next half an hour angrily typing in poll options to make sure everyone was aware of this disgusting, grotesque behavior. Finally, he would have an outlet to vent all his sexual frustrations.
And here we are.