I don't like "acting out" either, peaches.

Some others I don't like:
--"patient" when used to refer to a person in therapy
--"mental illness" in some usages (some people use that phrase to describe ways of being that I do not consider to be pathological)
--"treatment plan"
--"diagnosis"
--"homework"

Therapy-related phrases/words I like:
"healing"
"journey"
"share"