I think that sums up the OP’s point pretty well.
The OP is not defending using acronyms, per se, but is calling out someone who has made it their mission to complain about acronyms in an unhelpful, snarky way. It’s calling out this obnoxious obsession with finger wagging at people who made the apparently unforgivable mistake of using an acronym he did not know.
ETA replying to puzzlegal, but discourse software…