I've seen enough in the less-than-friendly skies to know you never confront an FA aboard an aircraft about anything, from their personal behavior before or during the flight to the temperature of the coffee. No good can come of this. You put your head down and get through the flight and the FAs, then take it up with management the next day if you really still feel strongly about it.
Pax involved should know people are in a hair-trigger state over mask protocols right now and not inclined to rationality.