Why do some guys asked if you are talking to them, when you are talking to someone else?

Okay! I was at Trader Joe's and as I was leaving out the store, I pretty much call for my mother in the back of the cashier, in order to see where she was. The cashier man looked at me and say are you talking to me? I was like no, I was talking to my mother and he was still looking and staring at me as if I was supposed to talk to him lol. The people around the cash register laughed about it, because that was weird 😐. I didn't even call for him lol. But I wonder why some men think you are talking to them, when you pretty much call someone else?

Why do some guys asked if you are talking to them, when you are talking to someone else?
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