Why would my coworker jokingly say this?

I walked into work today and I forgot my water. My coworker who’s older and sometimes lovingly gives me a hard time but sometimes I think she’s serious lol. Today she was like “there’s water in the fridge or are you too good to drink the water in there?”
I carry myself nicely lol. I’m put together and carry nice purses and always have my nails and makeup done nicely. I get told I’m pretty often. What did my coworker mean by this comment lol? Was she trying to say I’m stuck up or something?
Why would my coworker jokingly say this?
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