I rarely say anything but will always at least raise a finger (politely) to others on the road. But, as I have zero road sense it’s not very often I look for a response.

I have found with roadies/mtbers/walkers/horse riders that the further you are from civilisation the friendlier everybody is. The grumpiest are dog walkers who go all of 400m from their car before turning back (I’m a dog walker too), the friendliest are anybody at all that you meet in the middle of nowhere, miles from anything at all. That can include roadies up here but generally not the club run all the gear types. 🙂