I drive too and obey speed limits in the city, town, etc. On a highway I may let myself go a little fast but in the city with pedestrians and cyclists I drive slow and if it says 15mph, I go 15mph, period. I realize that most motorists want to drive as fast as possible in the given situation but that's not right and that needs to change. This should not be regarded as normal and acceptable behavior. I still believe that the OP didn't do anything wrong.

But then, I believe that 80% or more or drivers in USA should not be allowed to drive.

I only have problems when I am not taking a full lane and cars are trying to squeeze in. When I'm obviously talking the full lane I may sometimes get honked by a taxi or limo but I don't have any scary moments. That will, of course, depend on the area you're in but in NYC you just can't ride close to the side or you will get doored in no time.