I'm not sure why you posted this but it is not good advice, especially in a public setting. While it will stun some people as you say, if the other person is tough or intoxicated it could easily escalate the situation. There are multiple online videos of people slapping other people very hard after being pushed into a corner and it does nothing but start a melee.
Yes you should use minimal force (closed fist laws) if you are skilled enough, but use techniques that deescalate and de-fuse, like joint locks or throws that instantly take away the other persons will to fight. Slapping will have the total opposite effect half of the time and will escalate a situation quickly. I spent many years as a bouncer.
Yes, but you don't just go balls out against your neighbor, at least most of the time, because maybe you need to buy groceries from his shop etc.. and then if something does kick off you still have to go to his shop the day after, thats why you wore a mask the night before when you were shooting at each other, and why he wore one as well, the rest of the time its a slow burning pressure cooker. If you read the history of ulster you see how complex this type of situation gets after 10 generations. Trinity by Leon Uris is a good study in that.
Meh...Brennan is a disgrace, but this is a naive view. Many 1st gen are red pilled, at least the men. In New York, many of 1st and 2nd gen are Trump supporters, especially those from law enforcement and fire fighter families.
We really need to walk towards the fire with this type of bullying, not buckle to it. I know we don't like Ben Shapiro that much but his book "How to Argue with Liberals and Win" should be standard reading for everyone here. Liberals use the same arguments every time, (uneducated/redneck, racist, masochist, sexist, abuser) never facts just character assignation... They usually start with uneducated and work up from there if you don't back down, but this Karen just goes for the nuclear option out of the gate... really a bully.
Brave wee lady, at the front and didn't cry out. May her sacrifice not be in vain, unarmed as she was.