Imagine If I worked for Kellogs and I hired a guy to follow you and yell about how good corn flakes are every time you look at your phone, every time your TV shows go on a break, and every time you pass a billboard in your car, or a marquee on a building. Even if we assume that person does nothing else illegal somehow, that could easily still be harassment, which is definitely not free speech.
I’ve long know I wouldn’t make a good lawyer because you can’t say things like “Listen here you little shit” even when you’re right.