That is about the best advice, be polite. Being a cop is a tough job. There are two types of stops, felony and unknown risk. There are no routine stops. Stopping a car can be a stressful thing. You never know when it is a meth freak getting ready to snap or some guy on the run from the law.
Granted there can be ******* cops too. Often times it is younger rookies. But if you are polite you are less likely to get a ticket. Officers have alot of discretion on the giving of tickets. At least to a point. DWI is beyond that point and we love taking drunks in. But back to my point we don't want to be *******s, at least most of us, so a little respect will help us all get along better.