Steve, you come across like a religious fundamentalist when you say this sort of thing. Of course, you're free to do that, if you wish. Just like others are free to listen to Kamasi Washington -- or whoever else brings them enjoyment -- if they like.
Also, I don't think you're ever going to convert other jazz fans to your point of view about avant music by haranguing them about how "sad" their tastes are. Rather than bemoaning the fact that other jazz fan's tastes don't align with yours, maybe you could talk about why you LIKE it. Because that sort of thing doesn't require you to denigrate other kinds of music. ...Again, just a suggestion, just my point of view.
By the way, I've never heard Kamasi Washington's music. So I don't have any axe to grind one way or the other with regards to his music.
I'm just sayin'...