Looking like a man is pure bullshit tho. If you pay any attention to the world around you, it's obvious that the vast majority of men are absolutely hideous and smell very bad. Women almost universally age better than men, female aging is just more stigmatized because society is used to the average man being very ugly. If I'm unable to look completely female, it's better to be somewhere in the middle than obviously male.
Perfectly flat chest is far less cute. Honestly, the breast area looks bad on most people, male or female. The Playboy bunny era of American pop culture emphasized breast quality over facial attractiveness, this is no longer the case.
Gay cis men hate estrogen usage the most because they are the most c*m, boner, and male chest obsessed demographic. Estradiol directly works against their sexual agenda.