How not to teach - Examples of bad teaching

Some teachers are good, and others lack common sense. I hope this post serves as a guide for giving bad examples to make sure students don't understand anything.
These are some of the bad examples I encountered as a student.

How not to teach exponents?

Teacher This is how we solve exponents. (After some theory.. blah blah).. So to solve 22 we multiply two with itself twice which is 2*2 = 4. Does everyone understand how exponents work?

Students: Yeah. We get it.  22 = 2 x 2 = 4

Teacher: OK so what is 3

Students: Well that's easy.  34 = 3 x 4 = 12

Teacher: Oh no. you don't understand??

Whose mistake is it?

Case in point: Even if you give a complete theory, you can easily ruin it with a bad example.

Do you have any other examples of bad teaching that you want me to update here? Mention in comments.

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