What annoys me even more than partners getting involved in work issues is when mothers do it. I have had mothers of 16-20 year olds turn up to interviews and want to come into the interview with them, ring to negotiate roster times, call in sick (when it's not for a reason the staff member couldn't have called themselves). Drives me insane! If your child is old enough o have a job then they are old enough to be responsible for their own interview/roster/sick days etc.
On the partner issue I think we have to be culturally aware also that some woman are raised to have their husband 'take care of them' so the DH getting involved would not be uncommon in some cultures, especially if she has a male boss. this has happened to DH with his staff a few times over the years.