Why do some women give guys a negative hi response or negative tone?

I was at a small organic grocery store close to my apartment. All I did was picking up a 1.25 liter of pop. When I walked up to the cash register, someone was already being helped, so I waited like a genuine gentlemen would then when I was my turn, the cashier gave me that negative hi response or negative tone like

Cashier: Hi... 😑

I ignored her uncalled attitude, and I pretended everything was fine. I was getting this vibe coming from her feeling that she wanted me to pay then go fuck myself. After my purchase was final, I just left the store, and went home, questioning about her behavior towards me.

I had her a few times, time to time very occasionally with no problems, but today was uncalled for.

I was being a regular customer, nothing else 🤷🏻‍♂️

Why do some women give that negative hi tone towards men 😑

Why do some female cashiers would be nice to other customers in front of me but rude towards me 😑

I just don't get it sometimes 🤷🏻‍♂️
Why do some women give guys a negative hi response or negative tone?
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