I would say you should have no problems as the RAF are up on all the equal opportunities things like females, ethnic minorities and homosexuals - as they should be, as I think the colour of skin, etc etc, has no baring on you ability to do a job.
I will say, however, I think there will be a minute, very minute, percentage of people who manage to get into the RAF by keeping the opinions to themselves but are racist/homophobic/sexist, and this may cause difficultly – but with the 99% of the service agreeing with the equal opportunities decisions, I’m sure these people will soon be shot down, but with no actual service to my name, I could be wrong.