If you think someone is wrong very often, I believe saying why the person is wrong on every occasion will provide them with actionable information much better than calling them an imbecile. The goal is not to make the person go away, but to help them produce better ideas.
If someone verbally assaults me, I'll defend my point or, when provided with valid reasons, I'll behave like an adult and correct it. If I ever come across as abusive, let me know and I'll try to be a better person in the future.
Is that really too much to ask?