
Nazis are famously terrible company: they have poor social skills and a generally hateful and negative attitude towards the wider world. So it shouldn’t be surprising that they tend to only befriend other Nazis. After all, they’re the only people who can tolerate them.
Such low standards mean that these weird little hate-cliques can tolerate a lot: violent outbursts, untreated mental health conditions, poor personal hygiene, and so on. But there’s one thing that a Nazi might not forgive: Jewish ancestry.