Oh the ED usage here threw me for a loop (mainly in chat) 9 years ago! I shiver when I think that some quite naive member with an eating disorder goes to a regular site and uses ED---they will not be understood imo.
And the Bipolar Disorder and Borderline Personality Disorder ones are still not used correctly by some with the disorders.

It works out eventually.
I work at "allowing" and not correctly or taking it personally when some use the CPTSD "Complex" PTSD tag when there is no such thing. I think it has to do with a need for letting us know they really had it bad

(PTSD is one bear of a disorder!)
But I think every site has it's nuances...and stick around long enough you'll learn Psych Central's