A random stranger flipped me off for no reason. WTF?

[Digiwon]

Regardless of what he asked, you should never feel there's something wrong with you based on other people's reactions. Some people are just unbalanced and looking for trouble, unfortunately. Best way to react to these type of situations imo is to remain calm, breathing slow and with a poker face, as if watching a child throwing a tantrum, which is almost the same thing. Don't take this type of stuff personally and avoid interaction, as if that's nothing related to you - and in fact, it really isn't, even if the other person wants to blame you for that.