Interesting. I tell people all the time my brother is way smarter than I am, yet I was the ones in the GT classes. I'm not sure my brother would've been labeled as a 2E, nor do I think (from what I remember/been told) that he was gifted by definition or based on a learning concepts timeline, but it wasn't until high school that he was in more advanced classes for the subjects that he excelled in (history/social studies).
I get weird looks when I have I say I have a kid with special education needs. When I explain the situation, I get "well at least your kid is smart". True, but if his needs are not met, he will have other problems later on down the road, like his mother. It also doesn't mean that the problems that we do have with him now are any less as frustrating or difficult to deal with, etc...