Embarrassed beyond belief

Been out for a Chinese with work tonight and my colleagues actually had this conversation

Waiter "have you all arrived" in a Chinese accent

Colleagues "yeah we're all ALIVE no one murdered us"

I told them it was fucking embarassing and to pack it in then on the way out they ALL did Chinese impressions, I called them out and they're like " you know I'm it racist it's just a laugh" to which j responded "it's fucking embarassing, I'm embarrassed to be with you. Pack. It. In."

How do you deal with this shit??