Being an interrupter

Holy fuck, I hate being around white people who so enjoy being white.

What the fuck do you say when people make these subtle racist comments? I don't want to, nor am I really capable of ,educating them, but oh my god, it makes me sick. I don't want to participate in the conversation and it makes me super uncomfortable to even listen to it. What I really want to do is say, "You're being gross. It's gross to listen to you revelling in your priviledge without the slightest notion of how racism pervades your world view."

This motivated me to look up some resources about what to say (in a constructive tone) so that people know where you stand.