Let me start by indicating some logical flaws in the timing of the events: The office hours for the class were from 12.30 to 1.30, Monday and Wednesday. The class was starting at 2pm. According to your account, I showed up at 1pm, being 30 mins "late". Then the first student came in at 1pm and came out at 1.20pm? Then it took me another 50 minutes while I was running around? So I came to talk to you at 2.10pm, when I was supposed to be in the class? What time did I show up in class? 2.30, and half an hour late?
I do remember the incident but you are greatly exaggerating the timing. The first student was waiting, I showed up at 12.30 and she was out at 12.50. Then I did run down to the cafeteria to grab something to eat. Sorry, my blood sugar was running low, the line of students was getting longer, and I could not go and teach at 2pm for 3 hours straight without food. (Usually I was getting lunch at 1.30pm but with this line of students, things were not looking good.) At 1pm, I was back, we discussed the case and I continued the discussion with the remaining of the students in line.
You were waiting for two hours mainly because you were so worried that you showed up outside my office at 11am, a full hour and a half before the beginning of the office hours. Expecting me to be always in my office, and at your disposal, is understandable from the point of view of an undergraduate. But you may need to learn that professors have other tasks they need to accomplish during their workday.
Btw, I thought that the you got the joke about the "emergency" (that I had to grab something to eat), by obviously seeing me walking in front of you with a sandwich in my mouth. You can blame it to my bad attempt at humor.
Now that the timing issue is resolved, let me get back to the core of the argument, which I actually addressed in the post. It is the fact that I felt mostly sorry about: The fact that the cheating cases really changed my mood and attitude towards teaching this class, and this also affected the class dynamics. What you felt as unfriendliness was the direct causation of the cheating cases. It is very difficult to feel like hanging out with students when feeling that a very significant fraction of the class is actively trying to cheat. This the part that I said that I hated the most: the very different dynamics in class.
This is the part for which I should apologize: For now offering you the same experience as I offered to the students in prior semesters. Go and ask students that took my class in prior semesters. Or even check my ratings in prior semesters. I did not suddenly become an arrogant bastard.
PS: About the issue of a "true capitalist," yes I am a libertarian at heart. And I do believe that people respond to incentives. And I would strongly encourage you to read the article until the end.