I think you're answering a different question than was asked. When did it become acceptable to politely suggest a different personal choice? Since always, as you say. When did it become acceptable to disrespect them for a personal choice? Pretty recently, and should have been never. That includes the personal choice to rationalize that kind of condescending priggishness online. What kind of person gets their jollies that way? Those who live by the sword, and all that. Maybe it would be better if we could all express the same ideas in more respectful and collaborative ways, at least to start with.
Exactly. The article didn't mention disrespect, but BucketSort did. Two different questions. When peteretep replied to one with an answer only applicable to the other, it seemed worth pointing out.
In what situation would you walk up to a stranger and tell them to be mindful of themselves for carrying a plastic water bottle and it's not disrespectful. Mind your own business maybe?