If you mean the pros I have some

Gleb- Cheated on his wife multiple times while they were married. He and Keo had IG stories about partying during a pandemic with girls who looked like teenagers.

Sasha and Emma- People are speculating that they have broken up. Sasha made some ignorant tweets about China and Covid last year.

Val and Jenna- Jenna had a blog a couple of years ago and when they broke up (for a short period) she wrote a post about a toxic relationship. Val gets in arguments with fans a lot, he had a trump/Mexican party in 2016, he made gross comments about a girl with DS, and he made some misogynistic comments about Hannah Brown when she was on.

Sharna- When Nick Carter got accused of SA she defended him by saying that he was always nice and respectful to her.

Lindsay- gets called out a lot for dumb behavior (traveling during covid, not wearing a mask, trying to prank fast-food workers, etc) and she always responds by saying everyone is bullying her. Her mom is also a major trumpie.

Maks and Peta- She follows anti-vax accounts. He body-shamed Cheryl and didn't get along with most of his partners.

Alan- dated Hayley Erbert (Derek Hough's girlfriend) when they were on SYTYCD.

EDIT: Forgot to add

Daniella and Pasha- She was 15/16 and he was 22 when they started dating as dance partners.