This is something I've always pondered, whether it be music, art, literature, film, or just real life.
I mean, yeah, musical tastes differ for everyone. Everyone has their own opinion. Everyone has reasons as to why they enjoy a particular group or song. And everyone should listen to what they want to listen to, regardless of whether or not it's deemed "good music."
But is it really so bad to argue over the quality of music and assert that one song is better than the other? Personally, I'll take a constructive, civilized debate about music over some humdrum celebration of stupidity by stating, "it's my opinion all m00zik is subjective my opinion is a sacred cow now respect it
" I roll my eyes whenever someone resorts to crawling into the shell of "I am entitled to my opinion." Yes, you're entitled to your opinion. You're also entitled to back it up with reasoning and evidence to support why you believe this or that. You're most certainly not entitled to use it as a security blanket to protect yourself from ever opening up your mind or letting your opinion be challenged.
There is a ton of criteria out there for music to be judged, but is that really so bad? Does that have to throw out the idea of music being objectively good? A conclusion may never be reached between two parties, but that doesn't mean a truth can't exist. I say there's no point in enjoying or believing anything if you don't have the brain power to sort out as to why.
Anyway, I might have veered off topic, but this is my pseudo-intellectual shot at answering the question