One's enjoyment of a particular work is subjective, but there is most definitely such a thing as objectively good or bad writing. Saying otherwise is frankly an insult to those who are skilled at the craft. Humans have been telling stories to each other for literally tens of thousands of years, and we collectively have a good grasp on what works and what doesn't. We can recognize what makes a character compelling, what constitutes a feasible plot twist, or what sort of dialog flows naturally. Just because you yourself can't make those distinctions about a particular work doesn't mean that others can't.
There's no shame at all by being entertained by a work that isn't particularly good. But conflating your own enjoyment of a work with the measure of its quality, and then holding that flawed work as exemplary against other works, makes you look naive at best and utterly foolish at worst. And if you're going to stand here with a straight face and claim that Kubo of all people is a better story craftsman than Togashi, then you really don't belong in the conversation.