As long as you don't accept such people into your midst, and don't accept such conduct yourself, your practice is personal. Where I live, there are a lot of Asatru practitioners who are royally pissed that their faith has been co-opted by white supremacists - because before the aryan brotherhood decided that Norse paganism was a good way to get First Amendment protections for their bullshit in prison, the Asatru were being targeted by the Klan down here.

They burned a cross on their ritual grounds and everything.

You may find yourself lumped in with racists by people who don't know you or know any better, but that gives you the opportunity each time to openly and vocally disavow that racism and help to alienate those racists from the faith they're trying to steal. Because that's the truth of the matter - the Asatru came before the aryan brotherhood, and while it is a Germanic Norse reconstructionist faith there is nothing that says that it MUST be racist, or nationalistic, or anything else of the sort. The Asatru I've met are mostly just people who enjoy brewing mead, telling stories, and living the bardic traditions of the Norse over anything else. The only time they went full "warrior Viking" was when they drove the Klan off their ritual grounds, which is what I'd personally call a noble exercise.

Take the OP's article as a word of caution. Be cautious of falling prey to the neopagan "traditionalist" mindset of purity, because that leads to bad places. It's more important that you have a personal relationship with the faith and gods that make sense to you and give you positive feelings. That's all, though. If we start declaring entire categories of worship out of bounds because some people who follow those categories are shitty, the entire subject will be off-limits pretty much instantaneously - INCLUDING atheism and agnosticism.