dunno if this kind of whining belongs on this sub, so sorry if not.
i’ve been working in customer service my whole adult life and one thing that irks me more than anything, even customers who are snobby for no reason, are people who don’t even say “hi” or reply to my “how are you doing today?” before asking me a question/placing their order. it takes two seconds and really highlights that they just see me as a worker.