I try to have a glance and give a wave but if they don't acknowledge me and drive past it does not bother me.
A while back a R34 GTR was passing me and I turned and looked at him and he didn't acknowledge me...
I pulled up next to another R34 GTR at the lights and I turn to say "Hello", the driver just looked straight ahead...
Saw a R35 GTR driver last Sunday, who I looked him in the face, he saw me and just looked away...
They have the right to go about their own business and so do I... Not fussed.
I mean... If you see someone with the same shoes on, do you give a wave..?
If your having the same meal as someone else at a restaurant, do you wave at them..?
Seriously I don't see this as such a big of a deal...
If they want to say "Hi" then they will, if not don't worry about it.
At time, some Skyline drivers have waved at me but there was sun glare on their windscreen and did not see till the last minute, I would have easily give them a wave back.