My coworker and I got into an argument and he told me I have no common sense.

I told him I often have trouble understanding him because of his choice of words. He'll say things like one time when a customer was driving in, he said, "Oh no, that's her!" I asked who. He pointed and said, "Her." I asked again, That's who? He AGAIN pointed and said, "Her, in the car, right there." Eventually I understood that he just meant, 'There's a customer.'

But seriously? Who says, "That's her?" It sounded like he was saying it's someone specific like his wife or his daughter. That's what "that's her" means to me.

So we argued about it and he told me I have no common sense and I make assumptions. 😂

I can't think of anyone else who would say "That's her" in that particular case. What do you think?