When I look at the people who have gotten "canceled" over things they posted on the Internet, it's disproportionately GenXers.  

Why is that?

I think it's the awkward timing. GenX grew up on BBSes and Usenet which were a free for all.  It wasn't until the Millennials and later GenZ came on the scene that the raunchy, insensitive, or intentionally trolling behaviors of GenX got us into trouble.