No one flings abuse or anything else at cyclists (at least, not that I've noticed), probably because it's a fairly common sight. Cleveland isn't wealthy (hence the "can't afford a car" cyclists), and since I live near a university with a lot of graduate and medical students, I see a fair number of bikes. Fairly minimal hostilities, probably because people are used to them.

Riding on the sidewalk is perfectly legal here (at least, in most places), so people just ride on it.

Cleveland itself is trying to become more bike-friendly. The re-vamp of one of the main streets included a bike lane, and they just painted a bike lane near me. Granted, the former disappears and reappears randomly (and you have to make sure you don't get squashed by buses!) and the latter appears to double as street parking. I'll give them points for trying. On the other hand, we had that bridge project that failed.