Why would a girl choose to date a guy then constantly talk down to him about his age?

She was 21 I was 29 we both had limited dating experience actually I didn’t have any but moral of the story the relationship went bad and most of the time was spent by her talking down to me and treating me as if I was a elderly person based on my age

Why would a girl choose to date a guy then constantly talk down to him about his age?
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