I think the Hawaii example was rhetorical, but you can find examples of Americans being fired for supporting BDS movement or speaking against Israel occupation of Palestine, we even have laws against doing business with BDS supporters in some states. So we do evidently care enough about these sorts of disputes to make laws about them.
"we even have laws against doing business with BDS supporters in some states"
Link? I see some laws against state governments doing business with those companies, but nothing that says that a private business (like Marriott) has to fire supporters of that movement, nor do we have laws that prohibit those companies from doing business at all.
US government banned contractors using China-manufactured electronics.
You can make up all sorts of excuses about how it’s for national security, but from the otherside it looks like the US is simply unfairly preventing a Chinese company from competing in a foreign market that it has not natural entitlement to.
Whether or not the reasons for it are true, the reality is it has real financial consequences for Chinese electronics companies, even if they are fully legitimate and with good intentions. Thus it’s an example of how the US is potentially using political power to suppress foreign influence.
That's a completely different case than preventing private companies from engaging with BDS supporters. If you were talking about the government preventing Holiday Inn from taking reservations from BDS supporters, that might fit, but you're talking about a proposed bill to prevent the government from doing business with contractors using foreign electronics systems. That bill is very unlikely to pass, by the way.
Do you have an actual example of someone being fired for claiming that Hawai'i was its own country?
Edit: apparently you don't. Your analogy does not hold water.