Well actually I think what he wrote is true -well to an extent. All things equal in your life except your bicycle and a person with a car, they are being taxed more. However:
i. it is often the car driver's choice to use their car and pay the subsequent taxes, not yours. You choose to use a zero emission vehicle. You are effectively choosing to pay less tax, what's wrong with that? I'm sure some car drivers could do it sometimes if they wanted to.
ii. You could argue that the health gains by bicycling produce less of a burden on the NHS -something you pay your taxes for! You are more than likely subsidizing health care for some of those car drivers!
iii. if you own a car, you pay tax too. Perhaps you should also be out driving clogging up the roads and causing more wear and tear too?