Continuous verb tenses are generally not used for what some English grammar books call 'state' verbs. Most state verbs are what I call 'brain words' (for example 'think, know, understand') and 'heart words' (for example 'love, like, don't like, hate') (there are many others). Basically, you either like something or you don't, or at least for a long time. If you do change your liking, it is a change over a long time.
Continuous verb tenses are generally used for 'action' verbs - things that I am in the middle of doing now (or the time around now), that might change very soon, for example I am sitting on my sofa and typing this message to you.
Now, it is possible to use some state verbs in continuous verb tenses. If I say 'I am thinking about the lovely day I had today', it is probably a short thought - I might stop thinking about that very soon. If I say 'I think English is a very interesting language', it is probably a long thought - I think that all the time.
But liking chocolate is a long-term thing. I have always liked chocolate!