I have a serious question

So I was watching Baekhyun and Suzy's Dream and I saw these comments:

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Personally I didn't get why some fans got sensitive about it, it was a simple joke but it leads me to this question that, Why some YG fans think it is bad if a YG artist collaborate with anyone out of the company?Like this would be a dishonor for them ?
Why some fans think YG artists are better or higher than other idols,Like YG is one side and the whole kpop is the other side. I definitely don't mean to bash the artists or the company or their fans at all I just wants to know YG and Non-YG fans opinions on this.
I hear stuffs like they have original music but I think YG artists have some of the most American music influenced songs in the industry(not that it's a bad thing)or they say the make their own music but their are plenty of other artists in the industry that make their own music.So what's differentiate them so much ?
I've been a kpop fan for almost 5 years but I get these feeling for like 2 years now ,half of it from YG himself cause he acts like his artist are in upper levels than the rest of kpop or at least it's what I felt.
So tell me your opinion.