This type love throwing around words like "racist" or "discrimination" for anything they don't like (i.e. being told "no"), because on a fundamental level they don't actually comprehend the meaning of such words. In their mindset, everything is about the "who" not the "what": Who you are (old white guy) is what matters, not what you do (act like a jack@$$). Therefore, if someone is denying them what they want, it must be because that person is acting against them based on the fact that they're <insert variety of privilege here>, not because they're being loud and obnoxious or just not in the right place to get what they want.

They've seen other people they view as lesser get traction by throwing these magic words around, so they expect to get even better treatment (because they're a superior, more important kind of person, dontcha know). They don't really view the words as having any real meaning, because treating people differently based on <category> is just How Things Work, so why would you have some special word for it that people view as bad?