What's wrong is, after it's clear the advances are unwanted (a single but firm "no" is sufficient), continuing to make them. What's also wrong, though a lesser wrong since the signal can be missed, is the initial hitting on someone who has already signaled they don't want to be hit on. Wedding bands once served as a great social signal for this, "Don't hit on someone with a wedding band" is a simple rule to observe and follow, but marriage is dead, so it's not as useful. "Don't hit on co-workers" is also a simple rule to observe and follow, but come on. Enforcing that would eliminate a lot of happiness couples derive from such relationships, whereas enforcing the wedding band rule when marriage meant something wouldn't.
What's wrong is, after it's clear the advances are unwanted (a single but firm "no" is sufficient), continuing to make them. What's also wrong, though a lesser wrong since the signal can be missed, is the initial hitting on someone who has already signaled they don't want to be hit on. Wedding bands once served as a great social signal for this, "Don't hit on someone with a wedding band" is a simple rule to observe and follow, but marriage is dead, so it's not as useful. "Don't hit on co-workers" is also a simple rule to observe and follow, but come on. Enforcing that would eliminate a lot of happiness couples derive from such relationships, whereas enforcing the wedding band rule when marriage meant something wouldn't.