Why is this waitress like this?

I come in to the restaurant alone with my iPad and sit down and she goes up to me and quickly asks for my order and keeps from having small talk with me and she seems quiet and rushed.

With the other people around me she is all normal to,

She snubs me but quickly services me without any small talk or emotions

After paying the bill and leaving the money on the table I walk away and out of the corner of my eye she turns from snubbing me to darting to my table and collecting the money.

The next day I came in she didn't wait on me (I got another waitress) but she was giving me glares from a distance like her stomach was churning seeing my prescience,

What is wrong with this waitress,

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