Though with the nature as super hero comic, the past decades have also made the situation increasingly worse. As there needs to be a constant new evil organization of normal humans trying to wipe out, enslave or exploit mutants, while evil megalomanic mutants constantly need to show up and plan to do the same to normal humans. Essentialy giving the radicals on both sides fodder to fuel their anti-"the other" ideologies.
Though thinking about it.
With both sides constantly showing their worst and only the mutant heros having any white (or bright grey) shading (the other Marvel heros are only temporary presences and aren't allowed to constantly show up so the X-men can resolve the problems themself), combined with normal humans who aren't part of evil organizations being mostly sidelined as bit players or reduced to a backround filler (because the narration needs to focus on the heros, villains or enemies foremost so it's a necessary narrative tool i would argue), it's no wonder one can get the image that humanity in the marvel universe is a weirdly united faction against mutants, while the mutants are much more presented as actualy divided between the good, the and the ugly of their group.