And those people are right.A lot of people on this forum seem to deny, vehemently and aggressively, that sensors with smaller pixels have a higher percentage of noise in their output than sensors of similar design with larger pixels. They are strange and deluded people with zero understanding of how these things actually work.
Here are a few links to posts of a physics professor with "zero understanding." May we know what makes you so confident that you understand it better?
http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/noise-p3#pixelsize
http://forums.dpreview.com/forums/read.asp?forum=1019&message=31922352
http://forums.dpreview.com/forums/read.asp?forum=1019&message=31922793