There is (or should be) no stigma attached to being LGBT etc., so I don't understand how being called a lesbian is offensive. A police officer should not be so easily insulted.
A few years ago (quite a few) a mate of mine was policing the track of a football ground when a chant went up from the crowd:
"Who ate all the pies?
Who ate all the pies?
You fat bastard,
You fat bastard,
You ate all the pies".
He had a good laugh about it.