I have rarely encountered radical feminism. Only one incident sticks in my mind. For Darwin Day the field Museum was conducting a series of seminars on topics in Evolutionary Biology. One woman was trying to make the connection that rape is a consistent feature of males across animal lineages and ingrained in male DNA. It was entirely anthropomorphizing some behaviors completely out of context and would not answer questions by the evolutionary behavioralists. She could have considered decent counter examples such as female hyenas' dominance through social networks, or Bonobo sexual behavior, but instead went on an anti-male screed. I felt embarrased for her. Men have a lot to answer for and I have always acted in a sense of cooperation rather than confrontation ever since I read Friedan's The Feminine Mystique early in high school.
Radical feminism is a real thing.
It says that a simple accusation of wrongdoing on a man's part is sufficient to destroy his life and reputation, no such thing as due process or innocent until proven guilty, because #BelieveAllWomen.
It says that gender norms and gender expectations in a relationship are outdated and sexist, except the ones that conveniently benefit women and only women. For example a radical feminist will insist that the man's expectations for a women to be kind and compassionate to him is wrong since it expects an attribute of women that feminists say shouldn't be expected of women, but it's OK to expect the man to strong, tough and to be expected to pay for everything and open doors because only some gender norms are OK.
Radical feminism says that if a woman is snappy and even slaps a guy it's funny, giggles, the man probably did something to deserve it, tolerate it, etc. but the moment a man raises his hand towards a woman he's a terrible POS and deserves to be castigated for being a vile sexist.
I can go on, but the above examples dont even scratch the surface of what radical feminism looks like. All of the above and more ive encountered copiously in my lifetime, and makes me upset that society can be so tolerant of such basic double standards.
I always separate radical feminism from normal feminism, which calls out ALL forms of inequity and is against double standards whether those double standards are against women or against men.