Firstly, I'm specifically saying there should NOT be consequences to him from what he said to the cop. That's bogus, unprofessional, and terrible.
But that said you also have responsibility for your speech that goes along with the freedom. Do you think people should just say every single thing that comes to their minds to their peers at work?
If not, then are you (as you suggest about me) saying people should abandon their 1A rights at work?
Or would you (much more sensibly IMHO) say that if you go around being a dick to people then it's going to affect the way they treat you and the boss you keep insulting isn't going to feel full of love toward you and want to promote you.
Telling somebody to use their free speech responsibly (which is what I am doing) is not in any way the same thing as telling them to abandon their right to free speech.