Is it an abbreviation of a longer phrase? Or is it just kind of like the American street slang, "And what..?" As in, "You think you're hot? And what..?"
But in this case perhaps it is almost like asking if the listener had any "buts" or objections to the statement.
And you think that anger would make me flinch?
`You're going to verify THAT?'
Like I need you to tell me that.
'What would you have it?' said the Queen. (from Alice in Wonderland)
So what if I am gay? Is it a crime?