Green, teal, grey, white and blue look great combined, but orange, blue, black, yellow and pink don't.

I love blue and orange (Neku Sakuraba) and purple and gold/yellow (Buraikan)
No specific ones but I dislike eye straining colours when not used well, sometimes they're too oversaturated or they're too desaturated, those paired with grey or a midtone desaturated colour and very close values kind of just hurt my brain, sorry it's the artist in me I studied colour theory for a reason

To me orange & blue have always stood out as a really good color combo when used well Also when purples pinks & blues are paired together

Worst color combos are uhh . idk actually just anything with ugly colors like sewage green and shit brown But I never really like dark purples with reds