Why do people hate certain songs?

Well, there are several reasons. Some songs are very beautiful and well done, and others are funny. But some people have either personal or legit reasons for hating a song of some kind. I'll list a few:

1.) They had a bad experience when the song was playing.
2.) The song was playing in a film they hated.
3.) They really hated the singer.
4.) The symbolism in the song bothered them or caused negative emotions.
5.) They heard it over and over again on the radio or on tv, and got sick of it.
6.) The song was legitimately awful and no sane person would listen to it willingly.
7.) The song uses repetition and drives people crazy.
8.) They listened to the song to death in their youth and got sick of it over a decade.

Over exposure is one reason why I have hated some songs, just hearing them everywhere.
Another for me is over hyped. Often the song is not as good as they would like us to believe. Often the song is complete crap.

Two songs that fit the above would be Gangnam Style and Blurred Lines by Robin Thicke.

Any music with Auto-Tune can go straight back to hell where it came from

The Stones, Queen, Zeppelin, ACDC, Bowie, The Beatles, all of the perfect pop and rock voices required no Auto-Tune and they nailed it, sold out arenas on the power of their voices

By 2000 every talentless fool could have a hit and it's just unearned fame and crappy music...hell, I dislike most post-Cobain pop and rock music because he feels like one of the last authentic singer/artists to me

Opinions probably vary though

They sound bad.

I don't understand why people don't believe that large numbers of people can have the same reaction to something.

Especially in the case of pop songs, many do get so much over-exposure that it's not hard for millions of people to be genuinely sick of them.

Some songs are just trash. No shame in saying that