If something is not a fact that can be proven with evidence, then its just an opinion.
So if you come in with opinions and not facts, your argument is flawed, as you have no evidence to back it up.
So a person who is only armed with opinions is overly opinionated. And because they only brought opinions to the field, they're a twat, because they're defenseless.
Hence, with out knowledge, you can only be an over opinionated twat?
If you believe this is not correct, please provide facts to highlight where I was incorrect.