-misia: examples: JKR is transmisic. they're struggling with internalised fatmisia. "-misia" comes from the greek word for hate and it's already used in other oppression terms like misogyny. out of all the options, it's the most similar one to "-phobia" grammatically. there is no agreed upon noun for someone who is -misic, though i have seen -miser, -misist and simply -misic used for that. examples: JKR is a transmiser. transmisics are having a go under my youtube shorts. some transmisist insulted me.
anti-: examples: anti-aceness is detrimental to aces' mental health. transmedicalism is inherently anti-nonbinary. "anti-" means "against" and it's already commonly used when it comes to lawmaking, so it's intuitive. there is, however, no noun to refer to someone who is anti-.
-antagonism: examples: amatonormativity is aro-antagonistic. bi-antagonism is still common in queer spaces. the weight loss industry is full of fat-antagonists. "antagonism" refers to hatred and hostility.
-negativity: examples: using "gay" as an insult is homonegative. i have encountered transnegativity in the medical field. this suffix is pretty self-explanatory. it also complements "-positivity" which is often used to describe affirmation of a marginalised group. there isn't really a noun to refer to someone who is -negative, but you could just say "-negatives". example: transnegatives are ruining our community.
-hostility: examples: transhostility is on the rise. expecting fat people to hide our bodies is fathostile. another self-explanatory one, and another one without a noun to call -hostile people, but once again, you can just use the adjective as a noun. example: there were a lot of homohostiles at my school.
-hate: examples: IGM is a manifestation of intersex-hate. pan-haters think bi is the only valid label for multi-attraction. this is another very straight-forward one, although there isn't really an adjective to refer to something or someone who exhibits -hate. maybe -hating or -hateful. examples: banning transition for minors is trans-hateful. TERFs are trans-hating misogynists.
-ism: "-ism" as a suffix for oppression is already known from terms like ableism, racism, classism or sexism.
a short list of -isms: if something is anti-gay, it is heterosexist. if something is anti-bi/mspec, it is monosexist. if something is anti-trans, it is cissexist. if something is anti-ace/aro, it is allosexist. if something is anti-intersex, it is intersexist or perisexist. if something is anti-nonbinary, it is exorsexist. if something is anti-fat, it is sizeist.
there are many ways to not be ableist. choose one.