This makes me think of a book I've been reading, "12 Rules For Life" by Jordan Peterson. One of the rules he suggests is "Compare yourself to who you were yesterday, not to who someone else is today." We're all extremely flawed, and comparing ourselves to other people (or worse, comparing them to us) doesn't help anyone improve.

This is beautiful! I fully agree. You shouldn't judge people so easily. I also think that you should get to know a person before judging them, such as the girl you spoke of. She might be going through something that you didn't know about. Just try to give people the benefit of the doubt, it might just change your perspective on everything!