To go spare means to become very angry or irritated, but Uncle Sven would not be angry if he found out about the situation
Context: Uncle Sven would not even get slightly upset if he found out I spend my evenings drinking with negroes, but quite frankly I don't care.
Hypothesis: Uncle sven would go spare if he found out I spend my evenings drinking with negroes, but quite frankly I don't care.

Is the hypothesis incorrect? (Yes, no, or unknown)?