Does this Sound Like a Weird Environment

[workstresser]

I work in an office where I don't really click with many people. The ones in my team are fine.

I've worked in other offices where I've had good banter/a laugh with the other staff. I don't think it has anything to do with my personality.

Does this sound unreasonable:

Colleague, who is senior to me but doesn't line manage me, let's call him X getting involved with things for a senior member of staff I work for

X talking about other colleagues in the kitchen but I can hear what he says

Other colleagues who sit near me whispering to each other but I can sometimes hear my name being mentioned

X sending me commanding rude emails

Previous to this there were things going on which were bullying and I should have nipped it in the bud so to speak. After that things got better

My plan is to find another job as X will be unsackable but I am not sure how to handle all this

That sounds a horrible environment to work in.. the fact that they talk about colleagues in The kitchen and can be overheard is bad enough even without the rest.
It’s awful hearing your own name whispered though as you automatically feel it’s something negative, even if it isn’t. If you’re brave you could say ‘did you want me? I heard you say my name’. It may make things worse though.
I would just keep my head down, remain friendly and polite and find a new job asap. Good luck, I hope you find something quickly.