Cyclops presumably has a very biased recollection of those events based on his own "world that hates and fears me" past. Spider-Man and the X-Men didn't know each other well back then--and in subsequent years, Spider-Man has been a real stand-up guy whenever he's interacted with the mutants. So Cyke disbelieves the part where the papers blamed the death of Stacy on Spidey rather than Ock.