I think this evaluation of Carano's comment is barking up the wrong tree for a few reasons.
1) Comparing it to "Godwins" and other things you might find in this forum is missing the context a bit. There are plenty of things said on this forum that are easy to shrug off that would probably get you fired if you posted them in your public facing twitter account that had a lot of followers largely because of your very public role in a project your boss had invested millions in, that was part of a larger effort worth billions.
Just like there are plenty of things you can say in a bar with your buddies that you shouldn't say in a job interview. The idea that we're evaluating the "badness" of the tweet in a vacuum just misses that context.
I'm guessing most people in this forum have posted things that your boss would not want you saying out loud while their clients were listening to you and you were wearing the company name tag.
2) We established above, that it wasn't really that single tweet out of the blue. There was a pattern of tweets on controversial subjects. She had taken heat on twitter already for earlier tweets.
It's fairly reasonable to guess that someone from Disney had communicated some sort of "Knock it off". And that last tweet can be read as a "You can't tell me what to do".
I teach kids. If I have to tell a kid to stop disrupting class and he responds by yelling out "This is oppression! Just like the Nazis did to the Jews!" That kid is probably in trouble. Not entirely because their last comment was punishable in itself, but it's place in the overall interaction makes it the whiny straw that breaks the camel's back.
3) It kinda doesn't matter if we can agree that Carano's behavior was or wasn't bad enough or extreme enough to justify Disney deciding not to hire her for next season.
Through history, companies have always made hiring decisions based on avoiding the kind of press they didn't want.
Disney will also fire one of their park performers if they go on social media and say they "play" a particular character instead of Disney's mandated phrasing of "I'm friends with Ariel". You work for the mouse, they're super strinct about how your public speech reflects on them. In a vacuum, not saying "friends with" doesn't seem like it's a crime for which termination is the right punishment. But they've always been like that. Disney got where they are by policing public image pretty ruthlessly. That's not cancel culture, that's Mouse culture.