People who object to affirmative action programs or special hiring programs for people who aren't white are often called "racist". Same with people who don't support illegal immigration.

The consequence can be an angry social media mob that demands your employer fire you.

Sure, an example would be the opinion that "people should have the right to assemble and engage in free speech, even if they have offensive opinions".

Such an opinion could get accused as being a defense of horrible people, as opposed to a defense of everyone's universal rights.

And some people believe that if you even think that people who are engaging in offensive behavior should have rights, then that makes you just as bad as the offensive people, and therefore deserve to be the target of violence.

Even arguing in favor of free speech, solely in support of these rights, can get you accused of being a terrible person, and therefore a deserving target of violence.