I think where people get mixed up is that, when it comes to groups talking about pride, what they are really talking about is acceptance. So the old black pride movement, or the modern gay pride movement, was/is all about reaching out to folks who might feel shitty or ashamed of their status and getting them to accept that they have as much value as the majority population. It's pride as in bringing yourself up to equal status with the majority.

But actual pride, as feeling that the difference between you and another group puts you in a superior position, is something else. The White pride movement, for instance, would have more in common with the Black supremacy movement then black pride. There is really no need for a heterosexual acceptance movement because... yeh, we're pretty accepted. So we don't need to foster an acceptance of equality with the majority because... well, we are the majority. So all that is left is line-drawing at best, or if we are to be real about it, bringing ourselves up to a feeling of superiority.

This is where I think modern identity politics veers way off. It's useful to find socially minimized groups and say "Yeh, be proud that you are equal to the rest of us." But when you step off that path you just divvy up society in ways that aren't necessary. And you can say that about even the minimized groups when pride starts to seem more like secession. 

So yeh, I'm heterosexual and I'm perfectly happy with it. I'm not going to turn it into a big thing though, start getting ">" bumper stickers and get straight pride shirts, because that seems weirdly secessionist. I'll stick to smiling at tits.