When somebody has an idea in their head they often invest a great deal of emotion in that idea.
It becomes valuable to them.
They are prepared to argue for it and sometimes even fight for it.
In the case of tai chi, if you have a strong opinion about tai chi, then you start classes looking for a confirmation of your view.
Your opinion is naturally based upon the degree of exposure you have to tai chi.
If you start a class with certain expectations in mind, you will like or dislike the class relative to whether or not the class meets your expectations.
This is not a prudent way to commence your study of tai chi; the art does not exist to gratify the individual.