It can difficult to disentangle the difference between "don't know" and "I know, but don't like it". Especially because, let's face it, if you don't like it, you're not going to be as familiar with the terms and concepts associated with the thing as someone who likes it!
Which will nearly inevitably devolve into a conversation of "Do you actually not like it, or did you simply not get it?" because the "unliker" may not have the language available to explain their dislike, because it simply isn't a priority for them.
(This is also a summary of about 90% of the contentious threads here, BTW.)