Someone who believes that everything must be caused by an "-ism". Regardless of any evidence of an "-ism", this person will claim that that "-ism" MUST be the cause. Typically used with negative "-isms" in order to have an excuse to ignore the opposing argument. Commonly done when you have nothing else to say and want to feel victimized.
"Most Twitter users are ismists, every day there is something trending with racism or sexism even though it has no relevance."

"Stacey was called an ismist for being offended on behalf of another group, even though that group wasn't offended in the first place."

"Ismists Anonymous is another word for Reddit."
by BadTimeToGetLost March 28, 2021
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Someone who is prejudiced against -isms, or who hates -isms, or who thinks -isms should or do not exist.
Baldwin was an inveterate ismist.
by DiaboloDisguntolo April 5, 2017
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To have something against Insert-ism.

To be ismist is ismism.
Dude, did you see what Mike said? He hates feminists.

Yeah. He's a total ismist
by Chicha_s October 1, 2020
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