Ironically I think the cop was trying to give her a too much of an explanation out of respect for her position but comes off as a sniveling brat. If he'd just been a normal prick cop and didn't try to justify his behavior he'd probably have come off a lot better.
Instead, he starts sputtering on making it look like he knows he'd done something wrong. It's kind of like when somebody says something that isn't really intended to be racist but might be interpreted that way and then they realize there is a black person in the room so they start rambling on trying to justify that it wasn't racist only to make it look like it really was racist.