Am I absolutely clueless?

I was at the gym today doing incline barbell presses with a smith machine. There was a cute girl next to me squatting. I was there with my two brothers, I am in high school. Anyways, I bench with a grip where my thumbs go over the bar. This is referred to as the "unalive" grip because I can't say what it is actually called but you get it. She came up and told me that I
should use a conventional grip because I look
strong but I am limiting myself. I smiled and
explained to her that I wanted to isolate chest
movement rather than have to incorporate more forearms. She said ok and kind of explained what she thought I was doing. I then laughed it off a little and told her it's fine and she walked way. My brothers said she was totally interested and I seemed like a dick because I just smiled when she was explaining it to me. He said that she may have been staring at me before I started my set. Do you guys think she was trying to flirt? Did I seem like a jerk?
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Am I absolutely clueless?
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