A Nokian, or Nokean, is someone who opposes Lokeans. A Lokean is a type of pagan or heathen whose personal religious practice is primarily about following Loki. Some Lokeans also consider themselves to be Asatruars, or Wiccans, or other sects, and some don't. Asatru includes Loki in its traditional list of gods, so many Asatruars who do not consider themselves Lokeans do honor Loki, just not as their primary deity.
A Nokian actively tries to get people who follow or honor Loki to leave public heathen spaces or stay silent within them, and tries to convince people who are seeking a religious path that Loki isn't an acceptable part of heathenry. While Lokeanism is a religious practice, Nokeanism is a form of proselytizing. People who simply prefer not to acknowledge Loki and don't have a relationship with him are not Nokeans; they are just ordinary heathens, pagans, etc. who don't have Loki in their personal or group practice. A Nokean is someone who tries to control the personal and group practice of other people to get others to exclude Loki.
Lokeanism itself has been influenced by Nokeanism, even though the word Lokean was invented first and Nokean is a direct parody of it. That is because there was already a schism occurring within Asatru and heathenry between people who included Loki and people who excluded Loki before those who included him felt the need to retreat to their own safe, welcoming spaces to get away from online trolling and offline exclusion, and needed to come up with their own word, Lokean, to identify their path. The words Lokean and Nokean are products of internet culture, but the phenomenon pre-existed it. From the beginnings of the heathen revival in the US in the 70s, Loki has been considered the natural patron god for gay, trans, queer, etc. heathens, and exclusion of Loki has functioned to exclude his followers. Today, there are an increasing number of women Lokeans who may or may not be LGBT+ but Loki is still generally considered the god for LGBT+ people and also for mixed race and people with disabilities. People of marginalized identities are generally considered to comprise a higher proportion of followers of Loki than of other heathen gods. Closing previously Loki-welcoming ritual spaces, festivals, forums, organizations, etc. to Loki also discourages participation by such people.
Recently the heathen community has been reacting to Karl Siefried's opinion piece which ran on the Wild Hunt website, in which he compared Loki to Trump, which offended many Asatruars who are not themselves Lokean as well as offending Lokeans. Many prominent heathens have issued rebuttals to his premises and opinions, line by line, and some have also issued rebuttals to his claim to authority. His call to action has been criticized as calling for a new Satanic Panic.
Rather than issue my own rebuttal, which would seem superfluous at this point since so many good replies have already been made, I've decided to talk about Nokeanism, because there is more going on than an academic argument about what Loki symbolizes. There's an entire history in the modern American heathen community of a clash between pro-Loki and anti-Loki people and groups, and this has real life consequences for real people. This is why it's important.
Understanding that Lokeans and Loki-friendly Asatruars are used to the dynamic of attack onlline and undermining offline by Nokeans is critical to understanding why we find Siegfried's essay so offensive. Nokeans bully and silence marginalized people to the point of driving them out of Asatru into their own new sect now called Lokeanism. Nokeans write books full of transphobia directed at Loki and at his followers. Nokeans take over previously Loki-friendly organizations and festivals and make them into places that are no longer welcoming to Loki and those who love him, thus making organizations that claim in writing to be inclusive and nondiscriminatory into places that de facto exclude or sideline QUILTBAG people. Nokeans as well as other internet trolls attack women online for having religious experiences and drive them out of public Asatru into women-only safe spaces. There is more at stake here than a purely theological question. To take a public stand for or against Loki is to choose a side in this ongoing struggle.
Image: the Snaptun Stone, a historical heathen depiction of Loki