Ouch, touched a nerve there... Presumably, you're not dumb enough to go to a 3D movie _again_ after the effects the first time around? Thus, the number of people who actually experience these effects at any given screening is surely a tiny minority of the people present. And if you don't like it, you can watch the 2D version.
And no, my argument clearly isn't in defence of Titanic 3D. It's a response to every mention of 3D films being accompanied by people moaning about the effects stereoscopic content can have on a minority of people. My response is "enough already".