Is my toddler going to be a bad person?

My 2.5 yo girl is a really sweet and happy toddler overall, however, she quickly turns into an angry impolite a-h.. when something is not exactly as she wants. For example, she could be playing with me and if my mom comes nearby she'll shout angrily at her "NOOOO" without any apparent reason. Same thing if something that I do is not exactly as she had in mind. My parents confirm that she's much more nasty then me and my sibling as kids.

Does it mean she'll grow up into a bad person?

I've been using the cry it out method since she was a baby, and I'm also starting to wonder whether I caused these issues with that.