The proper response to getting burned is to shrug it off and prepare a good burn back, not explain how technically the thing everyone was laughing at and agrees was a burn wasn’t such.
He got burned by a little girl
You do realize that she went on the offensive, and basically insulted his masculinity.
If he wanted to play according to her rules, he'd have had to resort to attacking her womanhood. And that would have resulted in him being called a misogynist, which wouldn't have helped his account on Twitter.
He got burned because he didn't have a choice, and because social media wouldn't have appreciated him insulting her femininity.
Sometimes you just have to take a punch to the face... To retaliate in kind is suicide.
Edit: I don't think that him trolling her was called for. But her response was below the belt.
He didn't call her ugly, or a fembot retard. He could have done if he wanted to attack her according to how she'd conducted herself. But he didn't.