This isn't the sort of thing you can really debate anyway, everyone's milage will differ so I really want to keep this short and sweet (I can easily ramble so I've cut this down ahah). To answer your question, I'm not as big on MJ fansites as I used to be, so it's mainly here nowadays that I come my Michael dose. In the past I did used to visit MJ tumblrs ages ago, and currently I tend to read comment sections on any MJ facebook/website article I come across as well.
Over the years, yes, I have seen some MJ fans downplay or even outright ignore other artists achievements to make MJ seem better and I have tried to call them out on it. I've sometimes seen them share downright false information about artists to the point where even if I'm not fans of those artists, I've stepped in and been like
well actually..... Maybe they'll just straight up insult an artist. Sometimes it'll be as petty as calling artists by nicknames (i.e.
Justin Beaver), which I do find oddly hypocritical for a fanbase that hates a certain nickname for their own idol (and rightfully so). I'm fine with people not being fans of various artists obviously, I just think we should treat everyone the way you wish to be treated, ya know? Recognise their achievements.
Thankfully I've met MANY amazing MJ fans who are respectful of all artists. It's just unfortunate I've run into a number of MJ fans over the years who have lashed out at other artists to varying degrees and this, combined with some other characteristics, has sometimes left a bitter taste in my mouth and made me feel disconnected with the MJ fanbase at times. I have my on and off days
If you want to disagree, that's cool. I'm not interested in debating about this (how can you exactly anyway?). These are just some of what I've personally experienced over the years and like I said, your milage will differ!