I did not say that taxes are evil per se, but bad taxes are bad.

"This undermines the free market (...)" - yes taxes obviously affect the free market. They are often meant to skew (regulate) it, like tax that targets unhealthy products eg cigarrets.

Also, the way we spend money is not neutral to the economy. By buying one product over another we send an important signal about what is valuable. If we, as a sociaty choose junk, we will get more junk, if we choose good products, we will get even better products in the future.

I recommend you read about "the broken window fallacy", since it is related.