Answer:
Ad Hominem
Step-by-step explanation:
An ad hominem fallacy or argumentum ad hominem in full is fallacy that occurs when one attacks the character or circumstances of a person making an argument or statement instead of disproving the truth or the soundness of the statement or argument. This is exemplified in Karen's statement above where she mentions the occupation of the person making an argument instead of disproving his statement as false or truth.