Wow. This hits deep bro cuz I'm the same way and it's happened to me a few times.
It does hurt when you don't get that nod back because it makes you realize that the saying of "not all skinfolk is kinfolk" is true and a segment of black people don't view you as a "brother" like you do them.
You give off a different energy when you have a high level of pride in being black but it also makes you realize that the vast majority of black people don't have that same energy/aura.
Sometimes I wish I could start a new all-black society with nothing but black people who have the same mentality and high level of pride in being black.