Should I confront my gym trainer about this?

I was doing my exercise when my gym trainer came upto me and asked me to tie my hair from the next time I come to the gym.. There were so many people there, who started laughing.. I felt like I was being judged just for going to the gym with open hair.. There were some nasty expressions from a woman as well.. I felt really embarrassed.. I wear very decent clothes but I love to keep my hair open.. What should I do?

Should I confront my gym trainer about this?
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