Being a favourite pearson does not mean that someone is the best individual around, it simply means to be loved for some attitudes that might be someone else does not have. The favoritism arises envy in a way but it makes you feel good as well.
I was really wondering if a had a favorite teacher and likelihood the answer is "yes" , it remind me my schoolar years when I was taught by an English teacher which is a particular technic to teach the subject as none did before, to be a good teacher involves a lot of skills and I truly think she got them. I t coulbe be one of the cause she cought my atention and respect.
Speking of the qualities that a teacher must have to be favourite, it implies that aside from being a monster in from of the students he/she must become a friend of them in that way the confidence will be mutual and the educational process as well.
To sum it up. A good teacher always will be loved by their studend and there will not be anything to change the mind of the students about that because "What it good is always loved".