Well, if a Catholic can get to define Protestantism for Protestants, then Protestants can get to define Catholicism for Catholics.
Otherwise, Catholics are operating on a double standard, which I see is really not very unusual.
“Well, if a Catholic can get to define Protestantism for Protestants, then Protestants can get to define Catholicism for Catholics.”
No. For two reasons:
1) Only the orthodox can make definitions. Hence Protestants cannot.
2) Protestants defined themselves in the 16th century with their doctrines - defended here by Protestants all the time.
“Otherwise, Catholics are operating on a double standard, which I see is really not very unusual.”
No, we simply operate on one standard: Truth is truth.