Geektastic:

 

Somewhere in between those two is my generation (cue for a song..) which is Generation X (all those born between mid 1960's to the end of the 70's more or less). We are almost never mentioned in any discussion.

You are not the only one to have that thought, by a long way

https://www.google.co.nz/search?q=Gen-X+overlooked

I tend to think it's that "us vs them" is a simple distinction for people to make.

Boomers see "them" as Gen-X and Millennials (Y) both are "younger" than them and regard them as broadly the same compared to their own view, a single group.

Millenials see "them" as Boomers and Gen-X, both are older than them and regard them as broadly the same compared to their own view, a single group.

We Gen-X in the middle see "them" as both Boomers and Millennials, but clearly hose two groups are at opposite ends of the spectrum so as Gen-X we more readily and of necessity identify 3 groups than 2.