As far as Nas fans go, to be all the way objective, I do believe a lot of the overzealousness and protectiveness from his hardcore fanbase, comes from Jay-Z praise in the media. Jay over the last 15-20 years has become a media darling, and his misses aren't nearly as criticized as Nas' are, and some of his "hits" are more championed than Nas'. That plays a huge role into why Nas fans feel like they have to be guardians of his legacy and sometimes show extreme adulation in a way to overcompensate for the lack of balance by which they are judged.
I don't particularly believe Jay's work in the last 10 years has been significantly better than Nas' (maybe slightly, overall quality wise), personally. However, Jay has created such a iconic legacy outside of just music, just as a brand and a business, that even if these people in charge of bigger platforms do feel Jay has made a misstep they won't be so quick to say it. Whereas Nas has not built that. For whatever reason that may be. Nas doesn't have the same relationship with people who are in control over the narrative of the culture, so there's really no relationship to nurture or protect. So that need to tip-toe around Nas' missteps aren't there, and people have no issues amplifying them.
Nas fans feel him and Jay should be equally critiqued, since they are basically the A1 and Ab of Hip Hop royalty when it comes to living Hip Hop artists. They're both Mount Rushmore levels but only one seems to be treated as such in the mainstream.