I remember going into Ampador HM and we had a BLM that had a lvl 17 rod and all gathering accessories, not even joking, they had so little HP and pumped out so little damage that they were actively hindering the run. I suggested they get better gear for this kind of content, since you legit buy better stuff from vendors, I was told to stop being an elitist asshole. Also had an Antitower run where a MNK literally wasn't able to keep up Greased Lightning and was just mashing random buttons, I told him he can get more out of his class by doing combos, he told me to mind my own business and that as a healer, I clearly don't know what I am talking about (despite MNK being my main for raids)

Some people simply cannot comprehend that they do things wrong, whether by ignorance or stubbornness. I want to help people get better, but they take advice as a personal attack, so many times I just can't be bothered to try.