Why does my teacher rolls her eyes when she looks at me and?

She doesn't return my greetings... like ever.
Like.
'good morning, ma'am'
'Hello everyone'
And she's like (:):):)) like she smiles weirdly not like genuinely but instead like.. You know that smiles when u see someone you despise..
Whatever have I ever done to her?
I have never been treated this way by 'authority'
And people like me a lot :P
I just greet her everyday just to annoy her with a super cherry smile too..
But she isn't affected!! :(
Why does my teacher rolls her eyes when she looks at me and?
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