If these people are really being over the top rude to you get the plate number, call 911, and file a police report. I know this sounds a bit extreme but they really have absolutely no right to treat you and your baby this way and it is illegal to harass people in this manner. The police where I live will run the plate number and tell the motorist there has been a complaint filed and they shouldn't yell at people. This will probably stop them from doing this again. Not only are they being rude but they are creating a safety hazard by their actions. People need to know that they are not anonymous like they think they are - they have a license plate and they can be held accountable for their actions. They only keep doing s**t like this because no one has ever turned them in.