My 4 year old recently told me he doesn’t like my boyfriend?

I’ve been with him 3 years now. And lately my son has been saying he doesn’t like my boyfriend but also says my boyfriend doesn’t like him. . I’m not sure what to do... I mean they play together. Sometimes when my son isn’t listening he will tell him to go in the corner or to his room but I don’t see a reason why he’d say he doesn’t like him.. ? I also have a daughter with my current boyfriend now too... Anyone else has this happen?