Was the man who called Les angry or upset?
The caller from Oklahoma was not angry; he was a little upset with the teacher. His upset stemmed from the teacher alluding to eternal security for the true believer, though the teacher had not yet come out as boldly as later. So he was upset, not angry.
Les explains that he had been on the Tulsa station for probably a month or two when a gentleman from Oklahoma called. The man was not angry, but he was a little upset with Les. His upset was because Les was alluding to an eternal security for the true believer, though Les had not yet come out as boldly as he later would. The caller asked, "How can you do that?" So the man's reaction was mild displeasure, not anger.