Personally, I don't think revenge is a good way to handle anything, do you really want your work life to be about constant backstabbing and one-up-manship? Talk to the RT in person, privately or with a non-biased third person if you prefer and explain to them that you respect their knowledge and appreciate their help, but that you would appreciate being questioned and 'constructively criticised' AWAY from the patients bedside because you are concerned you are being undermined in front of the patient. If this doesn't work then go to the petty revenge thing, but at least you gave the healthy work relationship thing your best shot first!!!