I, just want to know what it means when somebody calls somebody else, parsley.
According to UrbanDictionary:
parsley
An individual who adds to the overall appearance or dynamics of a group but has no interesting qualities on their own. Similar to the herb parsley, which is used in many dishes as a garnish; these individuals "garnish" a group interaction (oftentimes in a party or entourage) but have no flavor or personality by themselves.
Don't feel bad for not knowing. Just from the context clues that it was something Hutch said, and it was clearly intended as an insult, I assumed it meant "is not a friendless asshat like the person using 'parsley' as an insult." I would take it as a badge of honor.