Mentioned this down-thread, but there's nothing wrong with defending groups from mistreatment, even if they experience some form of privilege — the whole point of intersectionalism is that these things have negative impacts on many other groups.

Harassing and discriminating against short men also has a reciprocal effect of spawning harassment and discrimination against tall women, and disproportionately affects trans people of any gender, people of color, and people who grew up malnourished either from lack of nutritious food or lack of proper sanitation leading to hookworm infections and other parasites (generally due to poverty, often as the result of neocolonialism).