Thanks so much for your comments, I really appreciate the support.
I think I was just so shocked in the moment that I didn't know what to say and let it slide. It was only when I walked out the door that it hit me. When I told my DP he was furious and wanted to email them himself. He's a mad keen mountain bike rider and spends a lot of money in that shop. Not any more.
I've drafted an email, I plan to send it tonight. I hate confrontation but am just so upset by this, I can't let it slide. I judge myself harshly enough without having other people throw in their digs as well. I think it just made me feel like people must just see me as a fat girl who needs to needs to lose weight, not as a person, I don't know if that makes sense.
Thanks again everyone, you've definitely made me feel much better 😊