I hope he lays into them, but I have a feeling he doesn't have the testicular fortitude to.
Juan is between a rock and a hard place.
If he doesn't forcefully stand up for himself, everyone will know he's a wimp who will stay on the Leftist plantation voluntarily.
If he does forcefully stand up for himself, he will be blackballed completely by the left, and like the good little communists they are, they will "erase" Juan from history.
To take the second option, he would have to decide to become a Conservative, but after watching Juan for many years, I don't think he will willingly give up those Leftist cocktail party invitations.