Depends, would you walk around recording everyone with your phone out right onto their faces without their consent?
He was definitely filming everyone without our consent.
A lot of people have done this, because at that point it's consciously making a decision to be an asshole and violating someone's privacy. The laws may not be on the side of the guy who hits the TikToker - and that's what they capitalize on, but morally, the guy throwing the punch would be in the right. It also depends on where you live, I guess. TikTokers don't normally do such stuff in Asia because you can go to the cops and file assault, but when they find out you were being the douche, they will not take any action.
* a negative is: the opportunities to enjoy oneself have sadly diminished...do one 'strange' thing in public, and you're on the web.
The best way to do this would be how Google solved this with street view. Capture your public photos, blur out people's faces - better yet, respect their privacy if someone requests to not film them. Eg. Google Street view will blur out complete homes if you decide to opt out.