Idk what raid it is but sounds like a simple one without dps checks etc.
I doubt anyone would act different in FFXIV in a similar situation, like a MSQ raid.

About world feeling silent i totally understand that and i'm with you.

I cant blame anyone for avoiding chatting outside of FC/linkshells tho, snowflakes/crybabies will report you over anything here and the GM's will barely check the report before warning/banning you.
So its far safer to not say a single word around randoms.