One thing nobody has pointed out, that I've seen anyway is how of all the crap Punk dealt with and talked about with WWE, it seems like he took that mentality with him to AEW. Alot of guys over the years have talked about how The Young Bucks don't really carry themselves as they should when they meet vets. Their was the infamous Booker T/Bucks situation for example where they didn't shake his hand and I believe one of them put their ring jacket on his chair. So maybe Punk went in there like that and that was basically the root of his issues with them?
Or maybe, and follow along with me here, he’s just an asshole.