Of course, all users of motor vehicles play by the rules, don't they?

Change that round a touch, to "if drivers want cyclists to consider drivers to be just another road user and treat them with respect then this sort of behaviour does US (drivers) no favours". Which is the crux of the matter, IMHO..
Bad drivers don't get good drivers a bad name; so WHY should a decent law abiding cyclist get his knickers in a twist over some idiots on bikes?
I really couldn't care less what other cyclists get up to. The only reason I care what other drivers get up to is that cars hurt when they hit you.