anti virus

I had some Apple phone tech support today, the apple tech person had me install that module where they can access your computer. One of the first things he did was have me uninstall the antivirus software I had. He said Mac's don't need antivirus software.
Is this true?

Browsing this subject right here at the Apple forum boards, an expert posted:
"Apple's computers are among the most secure computers available to consumers. Still, I would strongly encourage you to invest in anti-virus software for your Macbook" So what should I do? At the Apple App store, there are plenty of anti-virus apps, why are they there if it's something Apple users don't need?
Should I Re-load antivirus software?

Your thoughts would be greatly appreciated.