This is my criteria for blanking / ignoring people
I refuse to acknowledge:-
Bso's
Anyone on an Apollo
Anyone on something with full suspension
People in high vis
Wearing headphones
Wearing a helmet
Pavement cyclists
Red light jumpers
Fakerangers
Very serious cyclists
Not serious cyclists
People who wear safety boots
Anyone on a mtb
Anyone when I have had a bad day
People who look shifty
Men with pony tails
Anyone who has a glow in the dark bike
The above list is not final and I will often change at a whim. I do tend to relax my rules on cycle chat meets but only for a few hours. ;>)