cringe corner
A location that can be figurative or literal where you go when you are privy to something that is so cringe-worthy that you just want to pull a cloak of invisibility over your head and disappear until you regain composure.
That old man at the coffee shop made another racist joke and wondered why I didn't laugh. He and I were the only ones in the room and during the awkward silence, I just wanted to go to my cringe corner.