Not sure why this is downvoted. Your assumption could be wrong and categorically ruling that out without giving any real reasons means you likely are. Either way its far from a respectful attitude and doing that on shaky grounds is even worse.
At best your opinion is incomplete. It overlooks that people often take faked niceties quite bad. Like the parent post. And are not free but require mental effort. With humans not really doing multi tasking. And while a positive attitude is healthier all around, we are talking work environment here. I shouldnt need to worry if somebody thinks a short and precise "Yes!" could be impolite or sarcastic. Its an accurate response and i shouldnt have to worry about babysitting your interpretation. Seeing as we are all working together give me the benefit of the doubt. Its as simple as that. And if you figure that to be misplaced, do inform me as i might be overlooking something. That wont be a difficult conversation, i will be grateful.
edit: I would also be really worried how likely difficult conversations will be in such an environment. No amount of sugarcoating makes you fine with me kicking your favorite feature. And it might need kicking, no matter how attached you are.
edit1: In case it helps, the reason people take fake niceties in the workplace so badly is because it selfishly increases the required effort from everyone else to meet the bar you already set rather high. When considering what is acceptable people now have to plan around you lying. Instead of cooperation you are getting managed because you require too much effort and dont say what you want for which reasons.
Downvotes make a lot of sense seeing as he responded to the wrong post (ketzo was the post referenced)