I had enough. I proclaimed on Twitter that I would be leaving it behind — along with my 35,000 followers.

The racists, anti-Semites and broader world of so-called White Nationalists protest that any move to censor their hate would be an assault on free speech (orchestrated by Jewish overlords, they add for good measure). But that argument holds no water on Twitter, which is a private company, not a public forum — and one that has explicit rules.

Few read them, of course, but Twitter users agree to the company’s terms of service, and those terms are explicit on this matter:

Hateful conduct: You may not promote violence against or directly attack or threaten other people on the basis of race, ethnicity, national origin, sexual orientation, gender, gender identity, religious affiliation, age, disability, or disease. We also do not allow accounts whose primary purpose is inciting harm towards others on the basis of these categories.

And there is this:

Harassment: You may not incite or engage in the targeted abuse or harassment of others. Some of the factors that we may consider when evaluating abusive behavior include: if a primary purpose of the reported account is to harass or send abusive messages to others; if the reported behavior is one-sided or includes threats; if the reported account is inciting others to harass another account; and if the reported account is sending harassing messages to an account from multiple accounts.

It is not a close call when a user named “Holololocaust” tweets out beautiful women in Nazi uniforms, “Honorary Aryan” broadcasts portraits of Adolf Hitler, “Cato Maior” pursues his agenda under a confederate flag, and “NSRevolution” (presumably for National Socialist) uses a swastika as his logo.

Other things I have learned on Twitter: Taylor Swift has been adopted as the patron saint of the White Nationalists, apparently an icon of Aryan purity; racists and anti-Semites are obsessed with something called the “14 Words” — “We must secure the existence of our people and a future for white children” — and are particularly fond of holding Jews responsible for their own historical misfortunes, perpetually demanding that I explain why, throughout the history of the diaspora, the Jews keep getting exiled, brutalized and nearly annihilated. Message: We brought it on ourselves.

But Twitter appears determined to ignore its own terms of service, which also include a blanket prohibition on pornography. I can assure you that this, too, is flouted, since “Trutherbot Spawn” sent me a lovely and explicit GIF to illustrate his opinion of my behavior.