Cycling in Waterloo Region

[Markster]

I'd love to know what the difference is between a "person on a bike" and a "cyclist" is. I consider myself both!

Here's a fun thing you can do that basically give you a quick idea of what society considers to be the difference.  Just google it.  
It sounds like a "lmgtfy.com" joke, but it's actually a fascinating look into the cultural zeitgeist as distilled through google.

Google Image Search for "cyclist"
   

Google Image Search for "person on a bike"
   

A "cyclist" is seen as a lycra clad person cycling for sport.
A "person on a bike" is someone cycling to go somewhere.  To get something done.  In regular clothes.  

It's not to say that you can't be either/both, at one time or another. But there's certainly a cultural notion that "cyclists" are the platonic ideal of bike riding.