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Well well, the list is quite long but my top three are:
1. Sexual harassment, incest, or any work portraying an unhealthy relationship as a healthy one
2. Dumb side characters, no general character depth or development, villains with 30 IQ.
3. Unnecessary descriptions repeated all over the work to hit the min word count, some are very funny tbh...
The male lead descended from his horse and he was so beautifully handsome that all the world around him lost its color and everyone turned their heads towards him but he was uninterested blahblah he looked at the female lead and he took three steps in one and his soul-sucking-ocean-containing-night-blue eyes looked at her meaningfully and the world around him which had lost its color regained its beauty as he advanced towards her...so after three paragraphs the male lead could finally reach fl's side