I'm not even sure what a purity test is anymore... I've only seen it in defense of transphobia. I have no power over Colbert's choice of jokes. I can only criticize bigotry where I see it.

I've had tough conversations about transphobia with other trans people, supportive family members, friends... literal, personal, allies and I'm sill critical of them sometimes. Why the fuck should I give Colbert, with a huge megaphone and audience, a free pass?