"Joy is resistance" (and I'm paraphrasing) was used by Emma Goldman to mean that we should live happily in spite of oppression, not as an excuse to do things that enrich and empower oppressors. The whole point was to dance at the revolution, not pay the oppressors to take dance classes.
@theleftistlawyer I don't know if he drew from Goldman, as well, but this reminds me of queer activist Michael Barron's use of the phrase "queer optimism" in the recent historical context of queer liberation struggles in Ireland, and which encapsulates so, so much: