I got to kick one out of the DoJang, a male one, a few weeks back.
He decided to pitch a fit at me for doing the required temp. check (mind you, he'd had his temperature checked every damn time he'd come to class since we reopened, but decided for whatever reason to get on my case about it). It wasn't until he started loudly going on about how it was "bullshit," during a kid's class, where the kids could hear him cursing, that I told him to please leave.
I get people not wanting to wear masks or feeling like temp checks are invasive, but even if that had been his first time back, it isn't as though everyone wasn't notified in writing what the protocols were going to be and weren't specifically told if they were unwilling or unable to follow those protocols, for any reason, they were "welcome to attend online classes." Of course, he also has the option of not training. In fact, after that episode, I'd prefer it if he stopped training, or found somewhere else to train.