As always with this type of debate, the two sides line up -
one side thinks it is offensive and wrong, and deserved punishment,
the other side thinks it was humorous banter and the lady should have taken it in good part.
Neither will convince the other.
Personally, I think it was thoughtless and inappropriate, and unprofessional to embarrass someone on live television in that fashion.
That said, it was probably not intended to offend or embarrass the journalist, so an apology, which I believe was offered, should have been the end of the matter.
The conclusion it's easiest to draw is that this is a sledgehammer / nut interface, but the severity of the fine may indicate that this is a required message to both the player and others of their professional responsibilities when appearing on screen as part of their team.