Say a girl is 5 ft 90 lbs and her SO is 6'1 and both are athletes but the man is noticeably stronger. If she doesn't slap him as hard as she can or anything like that, but just enough to get her point across, would you say this is wrong?

Also any chance it's ok if she does it as a "joke?" Meaning not at all violently but say he's talking too much and she just taps his face with her hand and the guy laughs bc it didn't hurt it was just to get his attention?