Pointing out flaws is fine. Shitting on devs, is not, just like devs shitting on users isn’t.
Don’t be surprised if you attack somebody and they defend themselves.
Saying “X doesn’t work” is completely fine. Writing a rant about how opensource devs don’t think about people, yadayada. Buddy, these are people giving up their free time to write stuff. Nobody’s forcing you to use it. There are no guarantees provided, no warranties either. It’s provided as is.
The way you are is as if someone built a free house in the woods, you showed up and complained about how the door is creaky, the toilet leaky, a draft coming through the windows, and you wrote a review online disparaging the free work. Does that sound like good behavior to you?
Users can’t even add a feature request because they’re met with a storm of insults and snobbery.
How did you write the feature request? “I demand this be implemented because you’re providing a product and I’m a customer” or “It would be great if X were added for reason Y”? If it’s the latter and you were met with unkindness, of course that’s shit, no doubt.