I'm reluctant to say what's less severe, because to some people it may have been more upsetting than you might think just looking at the circumstances, because people are different.
Let's say a male supervisor asks a female constable that works for him out on a date and the constable, who may only have a year on the job, thinks that saying no to her supervisor might hurt her career. That is totally inappropriate and it would be dealt with, but it would be somewhat less serious to many than constant harassment, such as going to her home, calling her, sending her love letters by text or e-mail, which would be more on the serious side.
In the case of an acting staff sergeant who was going to be promoted to staff sergeant but lost his promotion over something similar—