I avoid judging entire genres as I prefer to assume that every genre has its gems besides variety of bands in all of them is way too big.
Let's look on metal. Most people mention it is about "screaming", being "dark" or simply "violent". And when I have to agree those bands do exist I know lots of bands that have none of those traits. And bands like Nightwish, Widek, Orden Ogan, SOME songs by Falkenbach (like Eweroun) prove my point right.
Then let's look on rap. Often I hear arguments "it's not even singing/music" or "lyrics are crap".
Here I will use polish rap scene. A comparsion of good AND bad rappers.
First let's go with bad one - Peja. He is Your typical stereotypical rapper who has bad lyrics about "living on the street" and "performing sexual intercourse with the police". He also once rallied entire audience during gig against one 15 years old who showed him middle finger while Peja was performing. That guy IS disgusting.
But then we have polish rap group 52 Debiec which writes deep poethic lyrics (I wish I could show but they are in polish sadly).
And to be blunt - rapping IS singing, people who say it is not have no idea how hard is it to rap properly. I know people who can do that. It is NOT easy to do.
Then we have electronic music. Sure, it has some terrible songs that can be heard on the radio, full of autotune or one melody repeated thousands times for no specific reason. But even check number of subgenres and artists that ARE NOT on the radio in the wikipedia. It is overwhelming. Also I heard few "less popular" songs sent by random friends. They are not half as bad as the ones on radio. Actually... they are really fun.
And same applies to literally every genre with exception for typical party music which was never made to be deep.
I don't blame people for disliking entire genres, don't get me wrong. But don't judge entire genre by few bands as there CAN BE other bands with entirely different sound. People still look for new ideas, try to add something new to music. Don't close Your mind on that, because random X band from the genre sucks.
Hugo out.