Sure, all of this happens. In the context of the OP, however, we are talking about a language that tends not to come with perks. This is the slang and patterns of those who have been excluded. Though, of course, it can be cool, in many circles to know their slang. To put this another way Gedanken is not complaining - in the examples - about business language and slang. Much of which is less artistically put together and also masquerades as formal and even becomes formal language in ways black street/rap slang does not. There we have a near dialect filled with slang that actually is part of a culture that actively excludes people, including the shapers of the the language G is complaining about. Knowing their words can help getting a jog and keeping and getting promotions/thriving. And the utterance of single sentence, like the one G quotes in the OP, would be enough to, for all practical purposes, end an applicants job interview. It depends on the context for me. Two people can speak Spanish in a Walmart - the original scenario - and I may feel excluded, but I don't consider them rude. I have this wish and counterwishes. To me the dissertation is more of a hzing ritual. It certainly can demonstrate certain kinds of thinking and the organization of that. But I think it is odd that it is one of the two gauntlets one must run, generally. That and oral interrogations.