It seems that a lot of people today have a really difficult time understanding that free speech does not mean you get to follow someone around yelling at them, you don't get to come into their home, follow them to the bar they go to with their friends. That's not free speech, that's harassment.

I'd go so far as to say that social media without a block button is unethical, and promotes propaganda and harassment. The block button means the user heard you, use used your free speech! Congrats! Now they want to walk away from you. Ooops. No, you are not entitled to get any response, nor to continue talking at them if they choose to leave the area.