I think it is simply that folk are, at this point, all out of good will. I recall when the BOBF trailer was released folk were excited. Same for Kenobi. But then folk saw the shows. Like the boy who cried wolf story, eventually people stop responding in a positive way and automatically assume it will be bad because that is the paytern that has formed. Most of the shows are either bad or a mixed bag. Not a good track record. Then there are the red flags in the casting, the trailer, the interviews etc. Folk aren't willing to give the benefit of the doubt. I will reserve final judgement for when I have watched the show but as it stands, everything I have seen indicates it will be terrible, maybe mediocre at best.
The hate for this show is not unique, the lack of goodwil is. That was eroded by Disney themselves. Do not assume the audience are at fault or somehow bad people, it certainly isn't that.