This is not a lesson, though it could have served as one had it been written differently.

This is a petty response whose potential value is completely obscured by the author's self-importance and condescension.

how is that interesting?

Both of them are. It is reasonable to expect that sampling classes that are scheduled at the same time will be acceptable. However, it's not something students are entitled to. The proper way to respond to such a policy if you insist on responding is to explain your situation and ask the the professor revisit his policy for the beginning of the term in the future.

I hate people.