Because these dudes not only talked a lot of shit but also endorsed some harsh actions toward some well regarded and revered artists, artists that were still contemporary and definitely had some contemporary, dedicated fans. And because they did so, fans might have said fuck all their shit I don't want to hear any of it. It just seems tighter wound with the emotional aspect of it because from what I can tell, jazz fans felt like they were being told to like certain things, etc. I don't know, not saying that it's a definite that people wouldn't be able to discern good from bad. Sure, plenty of shit talk all through the ages, but modern era press, payola and other things make it seem like this was more of a divisive issue.