And a difference between criticizing someone's performance and saying that they are talentless, horrible, and shouldn't be competing.
Saying someone is fat is not criticizing their performance, no matter how it is explained. It is criticizing someone's body.
As for sports psychology, depending on the school and program, it could just refer to someone who studied psychology, applied with a phys-ed degree, and is combining the two to work with athletes to work on applying psychological concepts to their performance. I know of some people who graduated with a sports psychology degree, but it was basically a mix of phys ed/human kinetics and psychology (with a few psych classes tailored towards athletics).