Is necessary to get so rude and personal? Seems like Rob's post was about riding his bicycle down the sidewalk while making a point to slow down and politely announce himself to pedestrians he encounters. To paraphrase, Rob apparently sees that as an opportunity to interact in a positive way with the people in his world. He thanks people, and I just bet may thus bring a little cheer into the lives of some of the lonely or sad people he sees.

You equate that to driving a car down the sidewalk and intentionally crushing pedestrians in your way?

Riding on the sidewalk is a personal decision and for some people includes trade-offs between a number of complicating factors. Those factors may not apply in your geographical area or culture. So give people a little leeway to make a decision that fits their lives and location.