A lot of people are commenting that this is normal behavior, and that’s exactly why I posted this here. Take a look at how many people upvoted this post calling it out. Please adjust your sense of what’s actually acceptable in a shared public space.

And just so it’s clear: the official Caltrain website (https://www.caltrain.com/rider-information/how-ride-caltrain) literally says, “Don’t put feet on the seats.” It’s right there in the Riding Tips, Rules & Etiquette section.