Playing the Sims is nothing to be embarrassed about. Anyone who knows me in real life knows I play it. A few (and very few) people started to make fun of me, but stopped as soon as I put it into perspective for them. Everyone does something that someone else could consider silly.
A lot of my friends are drinkers, so I just say: "Yeah, because we all know that sitting in a bar, wasting money by buying a toxin that destroys brain cells wholesale is
so much better." There's not usually too much more to be said about it after that.