Pop Rock genre is the worse and the most versatile in the site.

(sorry for my english)

I have been organizing my music in spotify and when i go to check the genre of some songs I come to find that many songs are pop rock, this confuses me and at the same time worries me because pop rock in RYM pigeonholes genres that, as a description, match but when listening to them they have nothing similar.

For example, when i hear the following songs they dont have nothing in common in the context that i want to make playlists with similar songs like these (specially with the new radicals, id like to find more music like that):
Kiss Me - Sixpence None the Richter
You Get What You Give - New Radicals
Scar Tissue - Red Hot Chili Peppers

And i know these songs has a poppy mix sound but for me arent similar, any opinions?