Why are people rude to random other people for no reason?

Aw. And yes you're right, sometimes people are just RUDE. It could be for attention. Maybe they are stressed & insecure and need people to take it out on. I'm sorry that you're having a bad day :/ but don't let ignorant people ruin it. That's why when you find nice friends, it's important to hold on to them, because there are so many rude people in the world. Don't let it get to you, their attitude is their problemo!