Aspectual Characteristics

I am still stuck on the example we had in class regarding the verb 'to like'. I understand that in order to use the present progressive form "I am liking", there must be boundaries in order to be appropriate. However, in our generation I feel this is contestable. When we say "I am liking this", its a form of slang, but I do not consider it inappropriate. When someone says "I am liking" I feel it is just much as a state of being as much as saying "I like". A state of being is able to change. For example, if you like a movie, it is a state, however it is possible to watch it so many times that you do not like it anymore. Therefore the state is changed. Why would it then be inappropriate to say "I am liking this movie." Maybe I am just over-analyzing the concept, but I find this rule somewhat contestable. Maybe I am wrong? (I DO have a habit of being a cynic about linguistics.) :)