@NaClKnight that's a great question. and a hard question, too. i'll try to tackle it, although my answer will likely be insufficient.
unconstructive negativity. genuinely offensive. "obvious" cash grab. low effort (vague, have to work on this one). critique that doesn't understand what it's critiquing. real personal preference that isn't tainted by the aspects mentioned in the previous post (music example: i seem to have a preference for certain time signatures and chord arrangements).