Why do some average girls think they are really hot when they are at clubs?

Anonymous
So I was at a night club last night with my girlfriend and I went up to the bar to get us drinks. The place was packed but I finally made my way to the front and ended up being right next to this girl. While I was waiting for the bartender I started talking to her, not even hitting on her or anything because I didn't even find her attractive. She was a 6-7 at best and my girlfriend is about as close to a 10 as a girl can get and she was behind me the whole time but the other girl didn't see her.

I am a pretty attractive guy myself and am way out of this girls league but I guess even average girls get hit on a lot at clubs so she thought I was hitting on her I guess. When the bartender came I ordered 2 drinks and she thought I ordered one of them for her and she got all bratty and was like

"don't even try"

I actually chuckled and said

"Excuse me? This drink is for my girlfriend..."

Then I handed one of the drinks to my girlfriend behind me and you should have seen the look on the girls face when she turned around and saw my girl. My gf was just smiling at her the whole time and the other girl got super embarrassed when she realized that I couldn't have possibly been hitting on her because my girlfriend looks like a model.

I'm not trying to be a dick but why would an average looking girl refuse a drink from a guy that is above her league and why be so rude about it? In any other place she would have probably been so happy to get any attention from me but in clubs a lot of girls become huge bitches to guys for some reason.

Why is that?
Updates
+1 y
To all the girls that are getting butthurt over my ego, I am guessing that I have insulted you because you see yourself as average and can see yourself in the same situation that girl was in. I really am not arrogant or full of myself in real life
Updates
+1 y
I wasn't a dick to her as you saw but if you think there are not leagues you are lying to yourself. People usually date people of the same attractiveness. This girl was just being a bitch for no reason and I was just pointing out that she wasn't
Why do some average girls think they are really hot when they are at clubs?
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