A person who's quick to oppose the opinions, input, or approaches of others in seemingly every aspect of life by always trying to correct others with their own input that they present in an instructive fashion
Ann: "I'll get Jerry some tylenol and-"
Pat: "Actually, when someone feels this way, what they need is chicken noodle soup and crackers."
Amber: "I'll run to the store and-"
Pat: "ACTUALLY making it from scratch is much more healthy than going out to the store and getting it."