Worst Combinations of Music Genres

I don't listen to K Pop but I strongly disagree on this being first K - Pop and rap can actually work really well together.

Doesn't Old Town Road kind of fit in this category?

It just makes me laugh

Country + rap = Crap!

Emo Rap is okay

Although I like jazz, the two together are worse than pop on its own. The rhythm, drumming and layout mostly comes from pop, while some girl meows in a hoarse voice, and a man is playing random notes on a saxophone, and someone is rolling his elbow on a piano. Not to mention that both pop and jazz lyrics are already weak on their own.

A genre based on American and one based on Jamaican folk music together? You should just add some sitar, bagpie, pan flute, steel drums and balalaika to complete the picture.

Prog - Musically complex with many themes surrounding its structure
Hi Hop - Musically repetitive with common themes surrounding its structure
Yeah, try combining those two. Doesn't work, does it?

I agree that disco goes with rock - "I Was Made For Lovin' You" by Kiss is basically a disco song made hard rock style.
I would add that surprisingly, disco also goes with metal, judging by some metal covers of disco songs.

Disco goes surprisingly well with some genres: Blue Öyster Cult's self-titled song is a great example of disco and rock together.

Jazz has 2 layers: popular jazz and instrumental (more technical) jazz. Popular jazz doesn't go with metal. But elements from instrumental (technical) jazz are used in metal, mostly in progressive metal (esp. technical death metal and progressive death metal). I think it's an interesting experiment but some results are better than others. Some metal bands just incorporated jazz better and I don't mind this combination when it's done good.
I made a list about it - Top 10 Metal Songs with Jazz Influences

Both genres are great on their own, but the culture beyond them is so opposite. I wonder if a metal fan can recommend me a great example of this combination.

Edit: I didn't know Cynic and Watchtower when I made this comment

Cynic, The Aristocrats, and Atheist are very disappointed in you.

Jazz and Metal should not be together.

By Christian, I mean religious songs sung in the church. Nowadays it is a fashion to sing pop songs about God in the church, but why?

God ain't real kids.

Together I call it "great-grandma music".

The hell is that

There's a metal cover of "Havana" with disco elements.

Some rock artists with rap on them are good, such as Rage Against the Machine, Red Hot Chilli Peppers, Beastie Boys, and Run-DMC.

This sounds so bad it sounds amazing!

HOW would this even work?

The main example of it is the song "Norwegian Reggaeton" by Nanowar of Steel. I heard this song. Then metal and reggaeton doesn't mix just like rap and country.

I put it on last place because I think it does not exist, but imagine it did...

How would it work?