A TUMBLR post by actor Mark Ruffalo has detailed exactly what he thinks of people who claim they’re not feminists.

Dubbing the ‘I am not a feminist’ school of thought “degrading” and “insulting”, Ruffalo does not hold back on the impact he thinks this has on everything women have fought for “the past 200 years.”

Here’s what he said on his Tumblr site:

“My response to the ‘I am not a feminist’ internet phenomenon….

“First of all, it’s clear you don’t know what feminism is. But I’m not going to explain it to you. You can google it. To quote an old friend, ‘I’m not the feminist babysitter.’ But here is what I think you should know.

“You’re insulting every woman who was forcibly restrained in a jail cell with a feeding tube down her throat for your right to vote, less than 100 years ago.

“You’re degrading every woman who has accessed a rape crisis centre, which wouldn’t exist without the feminist movement.

“You’re undermining every woman who fought to make marital rape a crime (it was legal until 1993).

“You’re spitting on the legacy of every woman who fought for women to be allowed to own property (1848). For the abolition of slavery and the rise of the labor union. For the right to divorce. For women to be allowed to have access to birth control (Comstock laws). For middle and upper class women to be allowed to work outside the home (poor women have always worked outside the home). To make domestic violence a crime in the US (It is very much legal in many parts of the world). To make workplace sexual harassment a crime.

“In short, you know not what you speak of. You reap the rewards of these women’s sacrifices every day of your life. When you grin with your cutsey sign about how you’re not a feminist, you ignorantly spit on the sacred struggle of the past 200 years. You bite the hand that has fed you freedom, safety, and a voice.

“In short, kiss my ass, you ignorant little jerks.”

The post, which written in March, has started to gain a bit of traction online thanks in part to the Reddit AMA Ruffalo hosted earlier this month. He used the AMA to address the backlash director Joss Whedon received from fans who didn’t like how Black Widow was portrayed in Avengers: Age of Ultron.

“I think it’s sad. Because I know how Joss feels about women, and I know that he’s made it a point to create strong female characters,” Ruffalo said at the time.

“I think part of the problem is that people are frustrated that they want to see more women, doing more things, in superhero movies, and because we don’t have as many women as we should yet, they’re very, very sensitive to every single storyline that comes up right now. But I think what’s beautiful about what Joss did with Black Widow — I don’t think he makes her any weaker, he just brings this idea of love to a superhero, and I think that’s beautiful. If anything, Black Widow is much stronger than Banner. She protects him. She does her job, and basically they begin to have a relationship as friends, and I think it’s a misplaced anger.

“I think that what people might really be upset about is the fact that we need more superhuman women. The guys can do anything, they can have love affairs, they can be weak or strong and nobody raises an eyebrow. But when we do that with a woman, because there are so few storylines for women, we become hypercritical of every single move that we make because there’s not much else to compare it to.”

Touché.