While that may be true, nothing will fix that in this upcoming election. Vote Biden, then set to work fixing our democracy.

Popping up every four years and complain about the two party system, only to disappear afterwards is never going to solve the problem.

You're a flawed democracy with an outdated election system. The FPTP one seat districts forces two party politics.

So you aren’t familiar with first past the post voting? Here’s a hint, it’s “how voting works” in this country.

Ideological purity is great from the privileged position you must be in. The real results of Stein voters in the last election is millions losing rights to bodily autonomy, children being forcibly separated from families, a Christian nationalism Supreme Court, and a president playing favorites during the worst pandemic in living memory. There may be some compromises needed to fix a broken system but third parties are not likely to do anything except split the vote and cause harm

So you voting for fascist cheeto or brain worms?

Hi! I'm a mathematician. I specialize in creating logical arguments as well as finding and explaining the flaws thereof. The Black and White fallacy does not apply here. First, we need to keep in mind the principle of charity, whereby we try to figure out what was meant by our interlocutors when we argue with them, as far as we can by what they said. In this case, the argument here is not literally that all votes that are for someone other than Biden are instead counted for Trump (this premise would have a great many flaws far beyond the fallacy you gave) rather, it is a statement of the failures of certain voting strategies which are well-established mathematical facts. Specifically, if you prefer candidate A over candidate B, and all other candidates have a combined extremely small chance of winning, choosing not to vote for candidate A is effectively making candidate B's victory more likely.

Hope that clears things up.

It's really an orange or grey thing.

Not in a two party system.

You can tell we have a great system of governance by how it encourages us to gaslight ourselves to relieve the cognitive dissonance it creates.

Where’s the part where it helps Trump?

The part where the reality is we have a plurality voting system ("First past the post") in place today.

We supposedly live in a democracy,

We do.

I’m voicing my opinion.

You are.

I'm not saying the rule of law should prevent you from doing what you're doing (I'm not a fan of fascism). However, you're being willfully ignorant if you acknowledge our plurality voting system, but claim your work convincing people not to vote for Biden doesn't also helps Trump become president again.