My question involves a group text conversation between friends whom are all native english speakers.
Friend A began the conversation with a photograph of himself dressed up for a night on the town, asking the group whether or not his outfit would attract the opposite sex.
Friend B responded by saying that he did not approve of his jacket and Friend C quickly agreed saying "he had already talked to him about wearing that jacket.."
Friend D defended Friend A by telling him that she really liked the jacket at which point Friend C responded with the one word "exactly". What was meant by this one word response in this circumstance?
It seemed to cause a mixture of laughter and offense but I do not understand the underlying meaning of this word.