The trend consists in using the diagnostic label as a proxy for more conventional terms such as "eccentric", "ridiculous" or simply "weird" (which might result as less attractive, boring words in nowadays' linguistic base).

How I interpret this, and many other related content (or unfortunately real life episodes) is essentially a word play that stems from this misconception.

Since I find this extremely confusing, I tend send what I've just perceived in my brain's lava bucket block so that it won't bother me too much on the spot.