I like this line,
Focus on the content, not the person.
I think people are here to answer questions about (and discuss) doctrine ... not to discuss each other.
It reminds me of a joke about Oscar Wilde:
Wilde claimed he could discuss any subject at any time prepared or not. A companion once took him up on this claim, asking that he discourse on the subject of “The Queen.” Responded Wilde: “The queen is not a subject.”
It's similar to the reason for there being a separate Meta site -- i.e. that discussing the site itself as a topic may be a boring subject for most users.
I take it that the term becomes pejorative if and when it's applied -- explicitly or implicitly to other users. It's not the term that's necessarily pejorative but its application. And whether or not such an application is accurate -- which may be debatable -- I think it's off-topic and potentially "Unacceptable Behavior".
Re. "using self-aggrandizing terms to refer to themself", one of the FAQs says here,
In general, unless you actually are the questioner's teacher, don't assume a teacher's mantle.
That was written in slightly different context (its context was, "just answer the question"), but it was highly upvoted and I think was good advice too. I gather that "asserting yourself to be superior" is canonically a form of conceit and a source of dispute, and I'd generally rather that users avoid disputes and sources of dispute.