Racism (in all its forms):
Definition: Any distinction, exclusion, restriction or preference based on race [as a social construct], color, descent, or national or ethnic origin which has the purpose or effect of nullifying or impairing the recognition, enjoyment or exercise, on an equal footing, of human rights and fundamental freedoms in the political, economic, social, cultural or any other field of public life [incl. e.g. hate against Muslims, antisemitism, apartheid and casteism].
(based on article 1 of the 'International Convention on the Elimination of All Forms of Racial Discrimination')
Hate against lesbians, gays, bisexuals, pansexuals and such.
Hate against transgenders, non-binary people, intersexual people and such.
Hate against queer people in general.
Sexism, misogyny and hate against black women (misogynoir).
Body-shaming.
Ableism (incl. COVID-19 denial/downplaying and anti-vaccination).
and other forms of discrimination not mentioned here.
Harassment.
Trolling.
Hate speech.
(sexual) Abuse of minors, adults and animals (also not virtual).
Glorification of violence, calls for murder, death threats and terrorism.
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Nationalism:
Explanation: We don't accept any form of nationalism of nation states. Regional nationalism (think about regional or ethnic self-determination and independence movements) is allowed, only without feeling superior than, or discriminating against, other regions, countries or people.
Colonialism (incl. Zionism), neocolonialism and imperialism in all its forms.
Fascism, right-wing populism, and right-wing and religious extremism.
Evangelisation and other forms of religious propaganda [local only].
Extreme sects and cults.
Marxist-Leninists (Stalinists, Maoists, etc) or other followers of extreme authoritarian (so called) communist/socialist ideologies/regimes (aka tankies).
Capitalists, including so called 'anarcho-capitalists' (ancaps) and neoliberals.
Anthropogenic climate change denial, downplaying the climate crisis, greenwashing and promoting deceitful climate solutions (like nuclear energy).
(right-wing) Conspiracy 'theories', hoaxes, fake news and other forms of disinformation.
and of course no spam and no commercial advertisement. If you publish continuously a very high number of public toots (excl. replies) in a short time (e.g. more than 1 toot every minute over a longer period of time), we might consider that as spamming. We also might consider repeatedly using large amounts of hashtags or mentions spam.