How do I deal with my sarcastic/pretentious coworker & roommate?

I’m working abroad and am being provided with great housing by my employer. I live with three of my coworkers, all in our early 20s. One of my roommates is a bit of an ass and generally kind of rubs me the wrong way. He’s 21, I’m 23 and he’s the only male in the apartment.

From day one, he’s struck me as kind of pompous and snarky. Criticizing others, telling me how to do my job, (I’m a copywriter, he’s a designer so he’s not qualified.) and always correcting or teasing someone about something.

It’s annoying and starting to get on my last nerve. The last straw was when he was criticizing my other roommate for allegedly talking too much when she’s already kind of meek and insecure. Next thing he says to me, I might just let him have it. He’s planning on leaving in 3 months so I might just have to bide my time…