"oh, please. you can’t REALLY be in a great mood. there are people out there who just got raises. people just got married. people are being reunited with their families right now. how dare you say you’re happy."
The equivalent of someone saying you can’t be sad because other people have it worse than you.
apparently you can’t like a band if you don’t know all the member’s full names, every word to every song they’ve ever written, how many times a day they use the bathroom, their blood type and own a sample of their hair.