Not everyone who disagrees with you is lying. Accusing people is a bad look here on HN. "Assume good faith" is the standard.

You can say "You're wrong". "You're lying", though, is almost never appropriate, and is, in itself, quite hostile.

Again “users are too stupid”. That’s remarkably hostile to users and doesn’t belong.

Please read my other comments. I'm not using "stupid" in the derogatory sense. I'm using it as a recognition of the skill/knowledge gap between technical and non-technical users.

Fine. But "you're lying" is also hostile, and also doesn't belong.

(I see that you edited that bit out of your post, so thanks for listening...)