Wrong.
All you need to disable things like that are the magnets that are on microwave waveguide isolators and couplers. What happens is those things don't know the difference between linear and circular polarity and they go into a multi-mode situation which destroys them.
Would you like a magnet to throw at your fridge? You'll need to expose your legs and rear end trying to get that magnet off your fridge. They are that strong.
Ummm. The microwave radiation induces high currents in the RFID microelectonics, and burns them out. This is very similar to the high frequency RF welders.