If thats all you see and hear despite you "branching out" to listen to more, than you clearly arent trying. Look, Im pretty ignorant of rap myself, most of it I dont enjoy, and the only "rap" artist I actively listen to is M.I.A....so I just dont comment on it, knowing that Im ignorant of it. If in the future I get really into rap, and I dislike certain aesthetics/groups, THEN I will comment on it. Don't form opinions on things you're ignorant of, and you wont get any flak for it.
Because that post didnt imply an ignorance of what you were bashing...it seemed that like many of us, you also were frustrated at poorly filmed performances, you demonstrated enough knowledge to criticize...thats all we ask. Stick to posts like these and you wont be attacked as harshly.