Why did my ex and his friends obsess over the girl he slept with once when she wasn’t anything special?

Anonymous
She was overweight and very plain faced. But him and a few of his friends were obsessed making a joke out of her, had a group chat named after her, saying how good she was etc.

I know I was a step up from her but I get they are all into big girls but why were they obsessed with her? They were the only people talking about hee etc it wasn’t like everyone fancied her etc it was far from that. So why?
My ex and them deemed her as much better than me
Something else like extreme immaturity?
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Why did my ex and his friends obsess over the girl he slept with once when she wasn’t anything special?
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