They call that creating a hostile workplace and it can result in time off without pay. I know that we have a right to free speech, but when we accept employment at a company, it comes with conditions. The folks in HR wouldn’t look at calling someone a scab any different than using a racial or sexist slur. It usually never gets that far, but if it does you could pay a price. There was a captain who got very vocal and confrontational with another pilot (not a scab) for not wearing an ALPA pin. He was turned into HR and told that wearing the pin was optional, to keep his opinion to himself, and that he was getting a couple weeks off without pay to come up with a way to control his anger. If the scab only goes as far as the CP or standards you’ll only get a phone call. If they buck it up to HR, you could be looking at time off, or worse. Not saying that I like it, but that is how it will go down if you deny a scab just because they’re a scab and they press the issue. Its no different in the eyes of HR to deny someone the jumpseat because they’re a scab than it would be to deny them for the color of their skin, sexual orientation, gender,..... It’s 2018 and the hyper sensitive PC crowd is in charge at the top.