When you say "acting oddly behind my car" can you please explain in more detail? If you are concerned always pull up and call the police; that or drive to a police station, petrol station or supermarket. Do not be tempted to confront anyone, just pretend you haven't noticed them and go straight to security personnel.
Avoid on the basis of a flag? No laws are being broken. Please look beyond your own fears, prejudices and superstitions. You're no better than the gullible sheep in Ferguson, MO, chanting, screaming and shouting about perceived racism whilst conveniently forgetting the actual FACTS about slavery. Just like the media spoon-feeding them their tripe. Meanwhile, slavery exists across the board, including hordes of racist bastards coming up illegally through the border. Obama turns a blind eye and lets them in to rape, pillage and murder, whilst the American media repeatedly and systematically plays it down in favour of doing just what you are: latching onto non-issues and manufacturing the news as you demonise someone exercising their RIGHTS. Racial hypocrite.
When you say "acting oddly behind my car" can you please explain in more detail? If you are concerned always pull up and call the police; that or drive to a police station, petrol station or supermarket. Do not be tempted to confront anyone, just pretend you haven't noticed them and go straight to security personnel.