my friend's husband is a cop one of the world's largest airports... Many cases where they have to remove people is when there is prescription drugs AND alcohol. Basically people already borderline personality/agresssion wise who are nervous or other reasons and take some pill they normally dont take to chill/relax/sleep ( have a bad reaction) and then have a drink or two or three and then just snap .
these are usually the cases where you see the tic toc videos of people being hog tied and dragged off while mumbling jiberish
Also the US culture is often so that many take personal offense of "rudeness" AND responses. if somebody looks at one the wrong way, mutters something, or saying something they find a tad rude it is personal offense and attack back and thus an exchange starts that can get ugly... Other cultures yes there is "rudeness" but rarely do you see the other respond back or call it out,, the "offended" simply moves on and ignores, brushes off and forgets as making a scene is consider more rude than the original rude offense.