As they did in the video, they're going to pull this nonsense w/ people they think they can get away with it with. The woman victim in the video is pretty much a wet noodle & easy target, I'd even feel a little bad for her if she wasn't a BLM supporter/protester but in this case, she reaped what she sowed.
If it were a more substantial male who stood up and got in millennial cuck or skanky karen's face I suspect the outcome may have been a little different. Not that you want to confront an angry dangerous mob, but when they're in a pack like that they're usually pretty weak individually when push comes to shove. You get up, you try and get out of there and disengage. I don't think that for most of us simply sitting there and taking it would be an option. Dump your drink in their crotch, that'll get their attention. I also don't see a crowd like that materializing anywhere in the 'burbs where I eat. A group of 4-5 cucks/karens? Yeah, but they don't worry me. And pepper spray is a good option.