I thought about dumping my ex when he told me he loved nickelback and hated pink floyd
What type of person was your ex?
He was a horrible person who has stupid taste in music.
Someone's taste in music rarely correlates to who they are as a person. Dumping them for such a shallow reason speaks negatively about you as a person so you should find a better excuse for dumping them.
I do not care. He's horrible and stupid.
It is simply unrealistic to think that someone is a certain type of person based on the music they listen to. Music is just preference so it doesnt really correlate to personality perfectly.