" is casual. Perhaps your grammar book was trying to sanitize the expression for formal use. I don't think it works.
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frostwhite"The story was so stupid."I would say, as stand, the sentence seems incomplete. You may consider changing "so" to "really".
dimsumexpressthe plot of the movie was so stupid ...that people got up and left".I'm with you on this one, dim. I've raised the issue before, but can't seem to drum up much interest in it. I think MrWordy has mentioned it a couple of times.
frostwhiteWould it be ok to say "The story was so stupid."Yes. This is non-comparative so.
CalifJimThis is non-comparative so.
AvangiI could never understand how concocting a name for something can make it right.It doesn't.
AvangiDo you happen to know if Wordy is onboard with this?No idea.