If one of the comments is 'are you on commission for David Lloyd'
Chances are, op posts alot of selfies on the gym with either the logo in the background or takes the place when she posts her photo. People do that because they want people to know they go to the gym and its a fairly expensive one.
Some of the comments are that she never posts anything negative. And, tbf, it's her Facebook she doesn't have to post anything negative.
The problem is, if you constantly post gym selfies, selfies of you in expensive places or highlighting your designer gear, but people know you in RL and know you life is very different from what you post on FB. People will generally, roll their eyes and probably keep their distance. Or take the piss.
Also depends on the relationship between the people. Non if my close friends would get offended at the comments people have made to op. But that's because we know each other well enough to do it without offending. Could be these people do genuinely think they are having a joke that op would find funny.
Also, these people do seem to know op in RL so have a better gauge of her personality wether it's pride in her appearance or vanity. That will be probably, be Influencing their comments.