I genuinely don't understand how a tiny bit of in-character chatter during an otherwise smooth dungeon run could possibly cause you any stress, unless you have a bias against roleplayers in general. I'm saying this as someone with anxiety so severe that even medication barely makes me functional.

Were it me, I'd have just smiled and carried on, because while I might be biased as someone that roleplays on occasion, objectively, this is FAR better than dead silence, never mind the bad attitudes and other toxic behavior.