Lay low, yeah. Some people are too close-minded to talk to about it rationally, and it sounds like your parents are a couple of such people. You're 17, and it won't be long until you're on your own, making your own decisions, living your own life, so grit your teeth and bear what you have to bear until you're out on your own. I don't think it's worth a major confrontation; just stay on the down-low while you're still living there.

I do think your dad owes you a new monitor though.