This is by no means a complete list. It isn't meant to be. Please add your reasons to it.
10) Because too many people think that feminism is redundant, despite the wage gap, the attacks on women's legal rights even in Canada, the abysmally low prosecution rate for rape, and the fact that 1 in 3 women still experience gendered violence from a romantic partner.
9) Because too many people don't even know what the word "feminism" actually means.
8) Because of "#solidarityisforwhitewomen". My feminism will be intersectional or it will be bullshit.
7) Because of transmisogyny. See above.
6) Because men lose self esteem when a door is held open for them.
5) Because women are half the world, but only 17% of crowd scenes in movies.
4) Because only 20% of paid work shown in G-rated movies is performed by women.
3) Because media keeps telling me that I am not thin or pretty enough.
2) Because media keeps telling me that I am too smart to get a man, and that my only aspiration should be to get a man.