I think it’s the distinction of whether or not it is voluntary. Buying things is a choice, taxes aren’t (outside of voting for certain political candidates who promise to use taxes in different ways).
A lot of people out there have short-sighted mindsets like “Why do I have to pay for schools when I don’t have any kids?” or “I have my own insurance, why do I have to pay into someone else’s public healthcare too?” People can’t be relied on to make the spending choices needed to support a healthy and stable society on their own, so taxes and public spending make it for them.
To add on to that, not all taxes fund things for the public good. In the US at least, and other countries with large military spending, one must accept that a lot of tax money goes to fund the military industrial complex. Taxes are also used to line the pockets of corporations via bailouts and overpriced government contracts.
Now I also believe there is no such thing as ethical consumption under capitalism, but taxes are nevertheless different from a voluntary exchange of currency for goods and services that one directly benefits from.
By that logic though, one could just as easily say that she should simply run under a bigger party’s ticket that is likelier to win elections.
Nobody’s perfect, but this is one of those things that is both easy to do and has a correct answer, like returning shopping carts. Twitter is a Nazi bar, no sane person should use it, and the only thing her presence is doing over there is giving the Nazis a more visible boogeyman to rally against. I’d honestly believe more of her supporters are here on Lemmy than over there.