I would find it hard to find that person even if I went to a gathering of Libertarians.
Being anti-income tax is different than being anti-tax.
Many Libertarian's are OK with (in one form or another):
- Luxury sales and use tax (not on necessities like food and basic clothing)
- Toll roads
- Property tax
- Local income tax
With property tax being a little less common (although I am personally OK with it) because a lot of people will argue that if you have to pay taxes on it you don't really own it.
Then again... I take that back... I WOULD be able to find that person at a gathering of libertarians but my personal experience is that he would be in the minority.
Edit: to add to the lats sentence, perhaps a very loud vocal minority.