First: I’m not a mod.
I just notice that when someone starts a post with a negative
“I don’t agree.”
“It doesn’t work like that.”
That’s all language that asserts (a little) “I know better” / “I’m staking our a place of opposition.”
In my experience anything else in the post isn’t as likely to be useful, and it’s likelier that the thread details after. So I tend to breeze past those.
But what can you do?
Why not try
“I’ve had a different experience…” (And say what it is!)
“Why do you think that? Are you saying (restate as you understand it)”
“It works like this: (and explain)
I just find a little positive phrasing goes a long way to convey that I’m being constructive.