Are Some People Just Too Happy?

Some people seem to think so.  And for being that happy, others try to down them as often as possible.  That's something I don't understand.  Why wouldn't you want to learn from someone like that?  I understand that they may be hiding whatever is wrong, but at the very least they can still have fun while doing it.  Basically, I see it as a person making the choice of whether they want to be happy or not.  No offense, but you're just dumb if you choose anything other than being happy.  I also understand that it's impossible to be happy in some situations, but in the vast majority it's not too hard.  Besides, seeing you smile may just make someone's day better.  At least, it usually has that affect on me.  I guess I just prefer to be around people who at least attempt to be happy.  Like I said, choosing anything else is just dumb.