I'm sure you've met more than a few, but most of the ones I know are very private and not at all flamboyant like you see in the movies. Also, the older generations tend to avoid all forms of public affection, as they grew up in times where that behavior could get you a lot of negative attention. It's actually a bit odd, I have had three principals that were gay and only one of them actually ever discussed their partner in a social setting. Now I live in a very tolerant area, but all three of them came from different areas of the country. I talk about my wife all the time, so I really can't imagine that. I think they just tend to avoid creating situations where someone might get offended.
I see this changing within a couple generations, and I consider that a wonderful thing.