This season I noticed had a lot of subtle mocking/digs at accents in particular American accent due to Vana in [you're fired] I mean it's alright once or twice in banter but to keep doing it leaves a pretty bad impression. They don't need to copy their style of talking when narrating an incident about them. Hope it doesn't happen next season if another from across the pond is called over

To be honest I think most of us would be mocked for our Mancunian accent if we weren't from there

I see nothing for you to be concerned about. Firstly there weren't many digs at Vana's accent anyway. I can't remember anyone immitating her accent tbh. Someone tried to teach her a Manc accent but that was about it for accent abuse.

Many people try and copy accents, especially if they are telling anecdotes. Not least Americans trying to do an English accent (usually very badly). Why would anyone be offended by it unless they were making some negative stereotypical allusion as well.