Millenial? I'm FAR from it. 52 years old for me. You guys are totally missing this guy's point, which is: if someone - anyone - says something nice to you, don't be rude and fail to acknowlege them. It's just impolite. MY mother and father taught me to smile and acknowlege people when they speak to me. If one is standing there and greeting someone and/or says something nice, then the other should smile or say thank you, or whatever. It's flat out rude to not respond to someone greeting you. Yes, I understand that some people may have someting horrible on their mind, but let's face it, most do not at any given time. To NOT respond gives off the impression that somehow this is the old British Caste system in which one does not acknowlege someone of a lower Caste becasue, well, they're just not worthy enough to be responded to or acknkowleged. They're beneath you.

The original poster of that comment who you are so quick to judge made it clear in subsequent posts that he was referring to basic common politeness, something which eveidently escapes many of you.