They're basically describing what it means to be a human being right there in a social environment.  EVERYONE goes through life anticipating, fearing, expecting and preparing for negative reactions from others over who they are as a person.  It's just that most people aren't hung up on it or call other people's preferences "microaggressions".  They don't ever think about the other person putting the bag on the seat because they're uncomfortable around people in general, or that maybe nobody around them actually gives a flying fuck about them.  Everything exists in their heads, all of their insecurities are projected onto everyone else so that even the most innoculous things that people do are seen as transgressions against them, rather than, you know, other people just living their lives as they normally would. I could not imagine living with the mindset that everyone is secretly judging me and actively looking for evidence of such.  They are so narcissistic they really just need to get over themselves.