His mother: Because he probably said a naughty word.
H: No; why did they block his hands?
M: Because he probably did a naughty gesture.
H: What's a 'naughty gesture'?
M: I DON'T KNOW. That's probably why they blocked it.
As far as Hank is concerned, the contestant gave the dreaded 'bunny ears' gesture. I'd like to keep it that way.