Flirting, or being nice?

I went out to the store today and got some wine and a tall boy bud light. And the cashier rung me up, he tried scanning my ID then he's like "i should probably ring it up first" lol and he looked at my ID and he was joking around "you got identification or not?" Then he kept saying it and I kept saying yes lol. Then he said is the "tall boy for him or you?" And I said it was for my friend.

Whenever I go there he always greets me as with anyone else. I normally use the self check out and he comes over to ask if I'm doing okay with everything. Or maybe he's being nice? I don't know I rarely get flirted with.
Flirting, or being nice?
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