The corollary--which I find to be at least as common, if not more so--is, "I like it, therefore it can't be bad, and all criticisms are nutty and/or haterism."
Nothing wrong with liking things that are deemed of high quality, but quality is a real thing - it probably just needs to be contextualized and defined (that is, what do you mean by "quality" in this context? In what way is something bad?). But recognizing the subjective element, and that "what I like doesn't automatically equate with "good quality," doesn't negate the reality of quality.