Men's Rights Activists (anti-woman internet trolls, not to be confused with people who actually fight for men's rights) often equate feminism to cancer, and they certainly have a point!
You may need to look deep inside yourself to find out you might be experiencing an unusual growth ... whether that's abnormal cells or a desire for gender equality.
There's lots of stigma involved. In the past, cancer was believed to be contagious, untreatable, and breast cancer was caused by milk clots -- as feminism has been incorrectly believed to be man-hating, woman-victimizing, and unnecessary.
In the same way that it would be hard to understand lung cancer if you only learned about benign melanoma, there's lots of differing movements within feminism. Some feminist movements may disagree on certain ideologies ... like what's the best way to create equal division of power among genders? Is Taylor Swift a feminist? Should feminism ever be compared to cancer?
As men can get breast cancer, most movements of feminism aren't just for women. Feminism opposes toxic masculinity, which hurts men as well.
Although some cancers are now treatable and some feminist causes have been addressed, there's still lots of work to be done. Just because testicular cancer has a 98% survival rate doesn't mean we shouldn't be concerned about the other 2% ....or not concerned about the survival rate of lung cancer.
You might not be able to empathize with your friends' life experiences and pain. But if you do ...
...hm, maybe this isn't the best comparison after all...