How do you??*Involves pudding*

Wow, you're an idiot. /Sarcasm. Oh I hope you die in a flaming car wreck. /Sarcasm I think you are a worthless pile of shit who only deserves to be shit and pissed on by the lowliest of life. /Sarcasm ... I guess it's ok that I said those things cause I was being 'sarcastic'.

Perfectly fine.

Seriously, though, if you're going to be sarcastic, learn how. You have to be able to do better than that. Come up with something more creative instead of the regular rigamarole.