If two people having an argument and after a third party chimes in, someone recognizes they're getting too heated and uncomfortable, chooses to explain why they're uncomfortable and then take an extended break, I think that's valid. Removing yourself from an argument is fine. You can always disengage.

If the other person in the argument then spends an additional two hours making wild, hyperbolic statements and doubling down in the face of multiple people trying to de-escalate, that's not a great sign. If that person has a long history of doing this, it's an even worse sign. Foucaults didn't get a ban for this one single incident of an unreasonable argument, this was just the straw that broke the camel's back for a user with a long history of starting and escalating arguments.