While that may be technically correct I don't think it's actually correct. Just because it doesn't violate the 1st amendment doesn't mean it doesn't violate free speech.
Democracy isn't just a form of government, it is also a type of society. Part of being a democratic society is that people are generally able to respectfully express themselves without fear of being punished for unpopular opinions.
> Part of being a democratic society is that people are generally able to respectfully express themselves without fear of being punished for unpopular opinions.
Well, yes, but I'd say the more important part is that students are having their visas revoked and being pulled off the street into immigration detention because of social media posts.