It's easy to see both sides of the debate. Owen Jones and slimy and creepy which makes automatically taking the opposite view to him pretty easy

but it's not clear cut either way.
Do some people lose jobs or platforms because of things they've said or done, possibly decades ago? Yup. Weirdos on Twitter dug up ancient tweets from James Gunn and the guy from the Flash, and they both lost jobs because of it.
It's pretty stupid to:
- go digging in people's twitter history
- punish people for typing words on a screen which aren't calling for violence
- and also to say those things in the first place.
To call it a "culture" is giving it more credit than it deserves, but there's definitely a ... movement? of people trying to remove people from the public eye for no good reason, simply because they have disagreeable views.
Using ScarJo, JK Rowling, and Jimmy Kimmel as examples that it doesn't exist is silly, as they're all immensly rich, popular, and good at what they do. Removing JK's work because of her views, and whatever ScarJo and Kimmel are meant to have done would do more harm than good.
Some rando on twitter taught his dog to raise its paw in the air and his life was ruined because of it. That's not proportionate retribution. An appropriate response would be ... nothing at all.