Dave Chappelle walked away from money out of principle when it came to making jokes about people like him for white audiences, but happily cracks jokes about trans people. He's a has-been and a hypocrite and Carlin would end his career.
What is this thing about some groups being "off limits" while others are fetishized and babied?
There's no longer anything "brave" in making a joke about a "safe group" to joke about.
In today's day and age since trans is the new sacred cow amongst certain crowds in the Western world, it seems natural that that would be the subject of jokes.