Madcasm
Saying things so mean and funny that people are confused if you're trying to roast them or just insult them.
'Oh sure, I'll help you with that. Because I have nothing better to do than make your life harder.'
'That's amazing. I'm so proud of you. You're like a superhero, but also a disaster.'
'I'm not being mean, I'm just being brutally honest. Which is basically the same thing.'