A question about criticizing someone's favorite/loved/liked subject?

Today, in my job, the radio played a song of the band Coldplay.
My colleague said “hey, that’s Paradise from Coldplay, great song!”
I loathe them, and I said that to him.
I added that I can not hear his whining to me voice and think it is fantasy-less music that I don’t even want to hear as elevator music.
His face went a bit sour.
I felt a bit an a..hole for saying this as I had the idea that I ruined his feeling for the band.
Do you give, when it is not asked for, criticism about someone’s favorite band/writer/painter/etc.
Is it considered bad etiquette?
Feel free to convince me that Coldplay is a good band, if you wish, but I probably won’t change my mind.
Paradise…........, my ass.