I’d say about 90% are. You occasionally get a jovial one and it throws you a bit.
I must be an oddity then, my experience is the inverse.
I’m generally quite jovial on and off the bike; nods, smiles and mornings for just about anyone who passes me in either direction, I’d say most reciprocate too and those that don’t don’t upset me.
I mean in day to day life do you acknowledge everyone else you see using the same mode of transport?
Some people just aren’t that comfortable with random familiarity so just let it slide IMO.
Maybe it’s the location and/or timing as much as the types of bikes/riders?
Out in rural Hampshire/Berkshire this morning, sun shining on quiet little B-roads while most of the lairy drivers slept off their second bank holiday hangover, there was lots of Roadie love going down, one guy offered me a hug*.
*(may not be entirely true)…