My team lead had a history of being vindictive. After 1 engineer left she talked a lot of shit on him. After another left (who was extremely well liked), she surprisingly talked a lot of shit on her.

Well I put in my resignation and reached out to personally thank her for the years of working together. I said she could use me as a reference any time. She did not reciprocate. In fact, her entire demeanor was cold and confrontational.

No idea why I thought I would be any different, she's just a shitty person.

She is pissed that she is losing you 😀

On a serious note, I don't expect anything from such people. In fact, I would be least bothered by what they think about you, let alone their expressions

Some folks just can't disconnect personal things from work.

And to some extent you can't entirely do it, but some folks REALLY don't have good boundaries.

It's sad, because they suffer a lot because of it too.

As for talking bad about coworkers:

My rule is I almost NEVER shit talk about anyone at work... almost ever. Hitler could work at my workplace and at most I'll say "he's kinda confrontational at times but I'm sure he means well..."

Granted, sometimes I do, but only to the most trusted folks.

Talking bad about folks at work or who were there almost only has negative consequences.

hell hath no fury like a woman scorned.
especially when shes petty.