I am playing the biggest asshole ever on KD right now, and it's hilarious. He is the most sexist, condescending jerk I have ever played by far and away. We are talking plates of food dumped in his lap first scene to making people make composure checks when he opens his mouth and the views come out. He's usually alright, if he is pretty sure the audience won't be receptive, but occasionally it spills out.
He is one of the EASIEST characters I have ever had to find RP with. I take him out and people are always OH GOD WHAT IS HE GOING TO DO NEXT? and then there are people. Even better than that, the character tends to grow on people despite everything. I tend to call it him dimpling his way out of trouble (dimple smiles fix everything).
There's a few keys to it, I've found:
In nearly every single pose that I make with people who don't know me, and my PC is being an asshole, I include at least one meta sentence acknowledging he's a jerk, usually mocking him for it.
Make people laugh, be over the top a little, get that 'oh my god I can't believe he just SAID THAT' thing going on.
I try to preload people, as well. FYI, this character is a jerk, I know it, feel free to abuse him.
Then again, the character is definitely there to be a punching bag, so that's probably different than most people who play assholes, too. I went into it with full intention of laughing hysterically whenever he reaps what he...uhm. Sow is a pig. Sew is thread. Uuuuuh. Reaps what he planted. Fucking Dory brain.