Wow, sorry for all these responses youre getting. Its a shame people feel this way. I dunno whats worse, saying things like that behind a persons back or saying it straight to their face. Either way, its just sad.
Anyway, if you regularly attend dog shows and are in the ring frequently (as in, if it is a major part of your life), then I would come out to your dog show friends because you shouldnt have to hide such a huge part of yourself on such a regular basis. On the other hand, if you only do a couple shows a year or something, just keep it the way it is now because it seems to be working. It can be a touchy subject for some people, so take that into consideration. If youve been invited to westminster, it sounds like youre quite a successful handler and show some pretty awesome dogs, which makes me think you probably go to dog shows pretty often... If thats the case, show them the real you.