There is basically every reason to hate spotify. They're run by awful people (who use subscriber money to fund awful things), they support awful people (who they pay with subscriber money), they actively hurt those trying to make a living off of their creative passions both within their confines and those outside by setting the industry standard for insanely low pay for artists, if not just cutting them off completely.
If you want to use a music streaming service, sure, whatever. I get that some people just want sound in the background and don't wanna take the time to buy, organize, store, and sync a music library. Hell maybe you don't even want to find an internet radio station that plays the sub-sub-sub-sub-sub genre of music that scratches that itch just right. We all make some shit ass decisions with our money to make it through the day. Just don't promote those decisions is all I ask.