Last week three University Presidents from Harvard, Penn, and MIT were questioned by House members on if antisemitism speech violated their codes of conduct. All three had problems answering when asked if “calling for the genocide of Jews” is a violation. One of the answers was "depends on the context" as if  calling for genocide could mean anything else. 

But what about in public where people are not subject to codes of conduct. Most of us will agree it's hurtful, but hurting someone's feelings is not the same physically harming them. There are some 1st Amendment exceptions like with court gag orders and social media TOS agreements. But if you see people holding signs on public property calling for genocide is probably protected speech.