I am the one stating it. I personally think that this is what happens to a lot of people. Perhaps your opinion about taxes will never change, no matter what -- but certainly some folks evolve their thinking once they get wealthy or as you yourself said act "socially liberal" only until the tithe box reaches them.
All I can suggest is for you to ask a trusted friend to read the exchange and give their take on it, preferably without priming or explaining.
Alternatively you can, for my edification, demonstrate by way of example -- how should I have phrased my initial point in a more palatable manner in your opinion?