1. I don't consider my Spyder to really be a "bike". A "trike", yes.
2. I've ridden for almost 50 years, and never considered myself a "biker", even when I owned a Harley. I was always a "motorcyclist".
3. The people the OP are complaining about probably just don't want those with something other than two wheels to include themselves in their group (after all, three wheelers weren't invited to join them).
4. Some people want to have an identity that's particular to something they have or an activity that they do, and don't want it to be diluted by others who do or have something similar, but not quite the same.
5. If we want to be included in the "biker" (two wheels) group, then we as "trikers" should allow quads (ATV) riders to be identified with us. And then if we do, then maybe the 6 wheelers (Polaris Ranger, Kawasaki Mules, John deere Gators) will want to be included also. It' just spirals outward, out of control, and becomes a source of irritation.
6. We ride because we enjoy it. Open air, great smells, different sensations, just good for the soul.
7.No need to argue or fight...no hard feelings....and no, I don't want to be a biker. I ride a Spyder...and that's good enough for me.
8. And no......no "bikers" allowed .