Is Not wearing a bra is trashy?

I'm was my parents house lounging around in sleep clothes (t-shirt, sleep pants)  and decided took my dog outside to use the bathroom. Quick 5-7 minute deal. Came back inside and immediately got scolded by my mom saying " please make sure you're fully clothed when going outside. we don't do those types of things around here. It's really embarrassing and trashy" I didn't think it was that big of a deal but I guess it was 

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