I'm not talking about asking questions. Surely you shouldn't ask questions that could be perceived as discriminatory.

My point is that since ordinary human conduct in a professional environment lets straight people reveal their orientation, the same treatment should be expected for gay and lesbian folks, and the expected reaction should be complete understanding and professionalism.

You're right that it will normally not come up in a job interview.

"People who organize gay parades etc.. are perceived as extremists who milk public budget." Not quite sure what this means, but it sounds suspect.