How do I deal with a mom who's super judgmental about second-hand clothes? Or how can I stop caring so much about her opinion?

Don’t get me wrong, I shop at malls and regular stores too, but today I went thrifting with a friend and found so many vintage clothes that are totally my style.
Still, I ended up feeling bad because my family is kind of against second-hand stuff:<
How do I deal with a mom who's super judgmental about second-hand clothes? Or how can I stop caring so much about her opinion?
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