Will someone misunderstand if a male boss knocks on a female subordinate's forehead?

There must be a misunderstanding! When a male boss knocks on the forehead of a female subordinate, of course, someone will misunderstand. This behavior confuses the relationship between men and women. So the male boss knocked on the forehead of the female subordinate. Let others see that there must be a relationship between them, which is very ambiguous. So what others see will of course be misunderstood.