Tell a joke to a liberal. Between your punchline and his laughter, there is a Progressive Comedy Pause. In this second or two, the liberal will process the joke to make sure he is allowed to laugh.
Is that joke racist? He mentioned Obama, but didn’t make light of him, so to speak. He also mentioned Michelle, but I didn’t notice sexism. Is it dismissive of the LGBTQIA community? Latinos? Muslims? Vegans? Will this joke hurt progressive causes? Will my laughter trivialize oppressed communities? Will I appear intolerant? I think it’s okay if I laugh. Yes, I’ll laugh now to signal my appreciation and to indicate that I’m not a joyless liberal scold.
I first noticed the Progressive Comedy Pause while sharing my hilarity at office staff meetings. The majority would laugh but the committed lefties would stare blankly, each eye like that spinning wheel your smartphone shows while an app is loading. (The PCP might be why progressives just hoot and clap at Bill Maher’s jokes; the laughter reflex is considered problematic.)