I understand this, and feel the same, but I'm not (nor is the person who first posted about the cold reaction of other unschoolers) talking about praise. I'm referring to a normal, natural human reaction of excitement or pleasure in observing children do something they haven't done before (and that they themselves are pleased about).
Imo, praise generally has an agenda (ie, the parent wants the child to repeat the behavior). Clapping and squealing in genuine delight as your baby takes his/her first steps is nothing like the cheesy, over-the-top, "good jobs" for every day mundane tasks. Same goes for a sincere, "Wow! I didn't know you could do that," when your kid figures out reading, or shoe tying or whatever.
Wouldn't suppressing real feelings be just as artificial as smothering a child with insincere praise?