I think guys watch my friends video on yt
Isn't that okay? Do you think a lot of guys watch her videos?
She has a lot of haters and those haters post videos about her, after that my friends comment section filled with male haters.
It is good that you want her videos to be successful and care about the hate that she is getting online. You should try posting positive comments to combat the hate the she is getting from others.
I would rather have her post more of her videos and have a command of topics she's discussing.
You are a good friend, helping her be successful despite the haters! She definitely needs to ignore them and just do what she has to do for her videos, and she would be very grateful that you stand by her.