YANBU it's a bit playground IMHO.
I came across this recently as I was in reception at my gym. We were waiting to check in for a class and there was a woman there with her friend. Friend hadn't been before and wasn't booked in so they were asking if there was a space. So far, so normal. The regular gym goer however seemed to think it was necessary to lay on thick just why her friend should get into the class - the conversation went like this:
"Can A come to pump this morning - she's not booked in but she's really keen".
Receptionist - "yes no problem, has she done Pump before".
Woman (laughing) " you don't know her do you? A is a real athlete, she can do any class, you're really lucky she's come here, she usually goes to the tennis club you know".
Receptionist - "right".
Friend - "yes I usually go to the tennis club but of course their classes are very popular and it's hard to get in. I wouldn't normally come up this part of town".
Woman "A is really really good, she'll put the rest of us to shame".
Later, in the studio, another woman comes rushing over to the first two :
"Hi A I didn't know you were coming, here take my bench, I'll get another and come next to you. I bet you're really good at this aren't you we're all rubbish!"
First friend - " it's ok, she's working next to me, I want to copy her" .
Instructor comes in, class starts, it's immediately obvious that A has never done it before and therefore has to use the baby weights. Instructor questions her experience (nicely) - turns out she's done it once, she's coming to our class because "nobody" will see her. 
.
These are adult women. I despair.