That's why I ignore people I don't want to give my attention to, works like a dream. Earbuds and sunglasses are like social PPE if you want them to be, maybe give that a shot if you can't handle day-to-day human interactions.

It doesn't make you look very sane, but as long as you don't have any communicative respiratory diseases, yeah it's whatever. If it meets any legal definitions of harassment or abuse, then sure, your legally entitled to press charges. But if it's a one-off...idk, plenty of mentally ill people yell gibberish at random people in public places every day, you're just one more.