And if she doesn't agree with you, whatcha going to do about it?

She has already told you previously that her sister runs a proxy forum site, so even if you ban her (name, IP address, email address or all of these) she'll simply come back to share her opinions and assistance anyway.

People like you need to be aware of just how little power and authority you actually have in these situations.

Katmando did not "insult" whomever posted (anonymously) that "dumb ass question", the person who posted it insulted and disrespected the sponsors of this site. Questions of this type should not be allowed here, nor should the people who post them. Your reprimand should have been directed at that jerk rather than Kat.