Earlier quoted context omitted.
These activists will find your place of employment and take it up with them. You can ignore Twitter but they will find you.
Sure, but that's been going on forever. There's a difference between activists that are motivated enough to show up at your workplace, and those who are willing to daylights out of you.
For example, Scott Alexander of Slate Star Codex mentioned in a recent post that people had called his employer and tried to get him fired because of the comments of people on his blog and the subreddit associated with it. (And he blogs pseudonymously, for whatever it's worth).