Why is this girl who lives in my building always so rude to me?

She always walks so close behind me when I’m walking out the elevator/door and once stepped on the back of my shoe and said “sorry” in a really passive aggressive tone. She’s literally right on my tail and I don’t walk that slow at all. No one else does this. She also chews her gum so loud in the elevator and snaps it.
This girl is really obnoxious and I wonder if I should report this.

Why is this girl who lives in my building always so rude to me?
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