With leftists and progressives the louder they are about their beliefs and virtues the less they actually follow those through. Just like with religious people, it’s just virtue signaling.

In my older age I've come to the realization that a lot of people join movements just to belong, not because they actually hold the conviction. I think in fact there are people who aren't capable of even having a conviction, just bouncing between whatever expressive habits are most convenient socially

You see it with things like politics and religion too

Sadly, this is a human trait overall. It's deep in the lizard brain section from early in our evolution.

If someone is part of a group and then does something seen as against the interest of the group (or groupthink, really) then any tiny little thing can become a trait leveraged against them. Either the person on the outs basically accepts demotion on the social ladder and hopes for re-acceptance from the group as subservient to everyone, or they're just out for good. It's one of our worst traits from a rational perspective, it's violent and irrational monkey-brain shit, and likely made for small homogeneous, tight-knit groups that could count on each other to survive harsh environmental conditions.

My favourite is the ones who scream about slut shaming then use "virgin" as an insult.

Although that seems to have fallen out of fashion lately.

That specific insult I mean, not hypocrisy.