The demonization of political opponents as Nazis (or sometimes as Communists, depending on who's doing the demonizing) is a common trope in US politics. I never really liked this tactic myself, regardless of which side does it. A lot of the problem also stems from the fact that very few Americans have a strong grasp of history, making it all the more easy for people to say things like this.
A lot of people just say dumb, ignorant things. They may not necessarily mean anything by it, though. That's where it gets just as ridiculous, when all of society makes a huge deal over some dumb thing that someone says. That reaction seems to do more harm than good. Would it be so bad to just ignore it and let it go? Is there some insidious agenda at work? Is Carano evil and possibly a Nazi herself for saying such a thing?
Nobody cares if some no-name, unknown redneck spouts things 100x worse.
The problem occurs when people of fame do it on a platform where they reach millions of people.
Sure, perhaps she is just an uneducated dumb woman who doesn't know better.
That doesn't change the fact that she is a famous person with a reach of millions on a public platform like social media.
The fact is that people of fame with a big following have a big responsibility in terms of being role-models. And what they say (or don't say) reflects back on the circles they move in.
Famous people with a great following on the internet, have big power. And with power comes responsibility. Maybe she is dumb and ignorant. To me, that's not an excuse.
Being a person of fame with a voice that reaches millions, she has a responsibility to educate herself and to be careful what she does and doesn't say on such a platform.
Sure, she is free to say whatever she wants (within certain boundaries because free speech is off course not absolute).
Others are also free to judge her for it. And she must realize that as a public figure, what she does and doesn't say on social media can and WILL have consequences and potential backlash.
If you are famous and reach millions with your platform, then be careful what you post. When in doubt, best to simply not post anything at all.
It comes with the job. It's the price you pay for being famous and gathering "followers" on a platform like twitter.
If she can't handle that, then she should either quit social media or quit being famous.
Nobody is going to care about her statements when she works at McDonalds flipping burgers with 23 followers on her twitter account.