Look, when a large number of generally caring, accepting people respond so negatively to something you've said, your first instinct should be to take a step back and ask why. Maybe take a minute to evaluate your own position.
It IS sexist to frame being like a girl as a negative/insult. The title of your post is inherently sexist.
It IS extreme that you feel like a certain kind of man would make you want to throw up and you are worried that your son is going to be that kind of man.
If your stress is about being overwhelmed and alone I imagine most of us here can relate. That isn't what your post was about.
Your post is directed at your son in a way that seems very concerning. I quit my beloved job as a professor to raise my son who has special needs. He is tiring, oppositional, and very hard to take care of. But I never feel the things that you expressed in your post. That you feel these things is what concerns me. No one is attacking you. I have had unhealthy feelings and responses to my son. It has been difficult to look at where my own unhealthy responses are coming from. Just as I would tell a mother with PPD that it is not healthy to have obsessive thoughts about harming her child. I'm not being critical or attacking, I am saying that she needs help because she is having unhealthy thoughts. The feelings you expressed in your post aren't healthy for you or your son. It is normal to need help and it is normal to have unhealthy thoughts. But it is important to be willing to get help.
The reason, to me, that I am reacting this way is the language you used about your son. Even in your second post you refer to him as lazy. A two year old simply can't be "lazy." It is your focus on blaming him that is triggering concern for me. HE refuses to pedal, HE is lazy, HE is the problem. I think what many of us are really trying to say is that he isn't actually doing anything wrong. It is your reaction that is problematic.
I really am very sympathetic to both parenting alone and dealing with a very difficult child. I have my PhD, have lived in places without electricity and running water, have killed poisonous snakes with a machete, have had many health challenges and raising my son is by far the most difficult thing I've ever done. I vent, I go a little crazy, I even sometimes resent my son some times. But those are MY problems, not his. He is not to blame - he can't be because he is a little child.