I'm not good at knowing whether someone is joking. You might say, "Hey Mike, go fuck yourself." And I experience at least one moment of not-knowing.
This is funny because on New Year's Eve of last year, I became surly and drunk at the same time and I started yelling people's names out and then flipping them off whilst they looked back at me.
A few years ago, actually like eight years ago, I was with my friends Justin and Clay and one of them said that when you insult someone sarcastically, which we did alot, you actually mean it a little bit. So I don't know what it says about my personality, but I always take it a little personally when I shouldn't. I should say, "Ah fuck you, jagoff" or "Yeah well ya mutha didn't think so" or just "Ahhhh..."