I wouldnt call you a moron at all for that. 2.25 is quite a bit higher than you should see based on the manufacturer electrical specs (although it may be correct). There is 150W of load for the unit, and I would expect the power factor to be around 0.9 since it is mostly resistive load. That would mean that a perfect condition radion would pull about 1.5 amps. Under poor conditions (aging, dust and hair causgt in fan, etc). The power draw could reasonably be increased to up to 180W and operate in the 0.8 power factor range. That would pull around 2.0 A and isnt far off from what you read. Therefore, between meter inaccuracy of the killawatt and a dirty fan, what you saw could easily be legitimate.
Side note, ask whoever called you a moron how to calculate current draw on an ac circuit. If they tell you its wattage divided by voltage, tell them they just one upped you in the moron category.