I could be here all day, but I'll stick to just 5 things off the top of my head that really get on my tits:
Just make a proper fucking ending, even if you just suddenly cut to a crash cymbal or a reverb tail or something, anything but a lazy fucking fade-out.
>overusage of sidechain compression / turning up the kick so loud that everything else audibly ducks when it hits
I've hated this nauseating sound ever since it came in fashion in the early to mid 00s, it honestly makes me feel sick. It only ever makes things sound worse, I don't get why anyone does it.
>ADHD hi-hats doing 32nd note autism
Nigger please stop that shit, your "beat" isn't "sick" just because you went full parkinson's on the hats.
>wonky beats / early/late kicks/snares
It doesn't sound good or make you sound cool, it just sounds out of time and like you don't know how to trim the silence from your drum samples.
>shitty breakdown cliches: pitched 808 snare rolls, sweeps out the ass, synths rising in pitch, the bit at the end where everything drops out except for some dumb vocal line, coming back in with just the kick and a shitty synth patch
It got old a decade ago, dump that shit the same place you put your autotune abuse and the word "shorty".