Telling someone to fuck off is fine. If we're talking about Reddit and some group that goes around spamming other subreddits, that's a different topic than the "punch a Nazi in the face" meme that repeats itself among the Orwellian types who see no problem.
Threatening someone by punching them in the face or social ostracism (which can range from discomfort to job loss) is a restriction of freedom of expression. That today people can talk about that casually while in the same breath saying that they support freedom of expression is deeply disturbing. "You don't HAVE to hand over your money to me right now. But, hey, there might be consequences..." - no one would argue that this coercion and a robbery. But "If you say the wrong thing there might be consequences in your job or life" is somehow getting a free pass.