It’s like when you’re a kid. The first time they tell you that the world’s turning and you just can’t quite believe it because everything looks like it’s standing still. I can feel it. That’s who I am.
—The Doctor, “Rose”, Doctor Who (S01E01) (2005-03-26)
I think when using words like better you are voicing your opinion and not providing any objective assessment on other peoples opinion. In this context I would interpret better as a subjective personal opinion. While a phrase like "a quote I like more from that episode: " would have also worked. In a forum using less words leading to a snappier comment is better for legibility.
But I can certainly see how the phrase could be considered negative.
I see your point that "snappy=legible", but it can also come at the cost of losing nuance, dialogue becoming an argument, and ultimately "snappy=burn" instead.
The reply above didn't signal "Nice one, though I prefer ___,” it reads like "Wrong! ___ is objectively better." I only reacted to this because OP explicitly called for personal favourites, and nobody should get to trump what others like.
Really? In a thread overflowing with votes for "Always try to be nice, but never fail to be kind," I think you're the one with a poor grasp of conversational cues.