Hi,
You'll find kiwis are generally a pretty relaxed bunch, not sure I can see the relevance of someone's sexual orientation to their training & flying.... gay or straight hitting on people that you're working/training with goes down just as poorly over here as anywhere else (unless of course, its reciprocated).
Its unlikely that you'd find Hamilton to be much different to anywhere else, (its just a whole lot smaller...) You'll get people who find it an issue and a whole lot of people who couldn't care less, probably more of the latter.
I believe we legalised same sex unions & other similar laws before the UK, so you may even find things more progressive here... if not Sydney is 3 hours away....
Just a hunch, but you might find more useful info by checking Google...
Vicky