AITAH for not playing fake nice with my friends partner?

So one of my close friends is in a LTR with this guy.

In the beginning I tried to get to know him but he basically brushed me off every time.

I dont know for sure but i get the vibe he decided he wasn't going to like me before he me. Basically my friend & I had a big fight like 8 yrs ago. & even though we're long over it a couple of her friends (who she met her partner through) really don't like me.

Anyways kind of the final straw of me trying with him is he made a big show in front of me & my friend, being like yea babe we can all play games sometime, etc. Etc.

& then when I brought up the idea with him later on. Trying to be friendly. he laughed in my face & was like oh nah don't want new friends, already got to many friends, no time for new games blah blah blah.

Then the next time I see him he's trying to be all buddy buddy with me & my husband but I also over hear him talking shit about us to his friends. Nothing to terrible but basically telling them not to mention certain things, cause he doesn't want us hanging out with them more etc.

So to me that's not a friend, it's insincere & I don't like to play weird frenemie games with people.

I'm the kind of person where if I know you don't like me I'm just going to mind my own business & not fuck with you. Also my friend made it clear me and him don't have to be friends.

So recently I saw them at a event.I think I was polite enough to her partner. i smiled, said hello, nice party, goodbye but that was about it. & it's not like he went out of his way to interact with me.

But I hear through the grapevine him & his friends think I'm being rude for not being super friendly. Basically not doing the whole super fake smile, bumping fists, pretending to make plans there's no way would ever happen thing

Idk AITAH?