While it sometimes sucks it's actually a pretty accurate portrayal of today's police. Youtube "police brutality". Keep in mind GTA is a satirical take on culture, whether it's the 80's or modern.
Really? Because I've been pulled over four times and never had a gun drawn on me or had a police officer try to ram me off the road.
Another time I went through an intersection and passed an accident where someone had t-boned and wrecked a police cruiser. Strangely, the other car was not riddled with bullet holes and the driver was alive and not beaten to a pulp.
These must have been flukes, youtube and the news are probably a much better indicator of what reality is like than reality is.
If you antagonize them in any way they will come after you. Even in IV if you did something like this (granted I never used the horn at them only once, did it a few times in succession) they could get you a star.
Luke Jaeger's Sleep Terror New Album and Live Show Fund: http://igg.me/at/SleepTerror Any bit helps, thanks!