Are you okay with SO being friends with EX’s?

Hi everyone I was really curious because my friend told me recently that his girlfriend is still in contact with two of her ex’s and it doesn’t bother him at all. I have never been in relationship before but just thinking about it makes me pretty uncomfortable if my partner was still in contact with her ex’s. He told me few reasons why it doesn’t bother him.

1. Their break up was not because of some toxic reasons or cheating but because they weren’t compatible anymore.
2. They are following each other on social media but they don’t meet up just occasionally chat because her ex’s are still friends with her friends. (She lives in small village)

This reasons are pretty good and I would definitely feel less uncomfortable but still I know many people who don’t talk to their ex anymore even if the break up was “healthy”. My question is those who are in relationship and your SO is still in contact with his/her ex’s how do you feel about it? Do you just let it go or did you tell them to cut it off?