Nice

So, I suppose I have another word or two to add to my banned-list. I really, really don't like the word 'nice.' Or 'good.' I mean, really, what do they mean? What is 'being nice?' Is is politeness? Then say so. Is it kindness? Then say so. Is it consideration? Then say so.
I know I'm incredibly guilty of this—every time I get told something, but I don't know what to say, I say 'nice.' It can be so multi-purpose, but I usually use it as the sort of dry, I'm-not-really-listening affirmation. What really bothers me even more, though, is when it's used in childcare. As it is so damn ambiguous to define, how are we really telling little Billy to act? So he pulls Suzie's pigtails. "Be nice, Billy." Honestly, I'm confused as hell when I'm told that, how is Billy supposed to figure out that 'nice' means to keep our hands to our own bodies, and use words to ask for what we want?

Nice is a really not-nice word. Plus it sounds wishy-washy when you say it.