Agreed.
One of my friends plays White Mage as their main job. Their usual 'outfit' of choice is the fierce tyrant's attire
https://i.imgur.com/0EHqOcb.jpg
So, as you say, the statement made by the person you quoted has already been defeated.
And in terms of their comment "So again, when someone wears a pig costume or a bikini, you don't think "he/she is wearing that 'armor', so it is class/role X" - no, I think they look stupid and have no idea what class/role they're playing because they look ridiculous and I therefore really don't care what class/role they're playing.