You can explain why someone is an arsehole but, you don’t have to excuse shitty behaviour if you are on the receiving end of it.
But some of what's been references on the thread isn't 'shitty behaviour', it's instances of people who do a particular type of job switching off their public persona, and being blamed for it.
Some comedian up the thread was being blamed for switching off his smiley persona when the cameras stopped filming and being bossy or cold with the crew assuming he wasn't actually being abusive, I think that's unfair. I don't feel the need to charm the birds off the trees when I'm around people who are working with me or for me and busy, especially if they aren't doing their job effectively and it's preventing me doing mine. Someone else (Meghan Markle) at some kind of reception was described as just shaking her head and occasionally saying 'No, thanks' to food, like that was a bad mark against her but again, I don't make friends with the waiters or caterers at work events. I'm polite, but my focus is elsewhere.
I happened to have a drink with Cillian Murphy and some people we both knew once, years ago, in Galway, and the sheer amount of times he was approached in an hour or an hour and a half, even in a small, obscure little pub and a low-key city like Galway, was exhausting -- and he wasn't anywhere near as famous back then, as I think it was before Peaky Blinders.