That’s not the problem of those people. It’s no excuse for attacking them.
There are ways of expressing that disaffection whilst being happy for the people who like the current take. And you are more likely to win people over wish positivity than negativity.
And you say you like Level Up. So it’s not as if you are completely alone and no one is making stuff you like. Why care what WotC are doing? I’m not planning and rushing out and buying the new rulebooks, old rules, new rules, it’s not important to me (and I always thought World of Greyhawk was garbage). I just hope the new DMG does a better job of encouraging people to become DMs, increasing my chance of some time off.