What is the ruling on insulting Allah's creation, such as saying: "This man is like women," and "This girl is ugly like men," and "In this nation, you cannot differentiate between a mother and her daughter," and similar statements?

It is not permissible to insult people, whether individuals or groups, and that is not part of a Muslim's character. The Prophet, peace and blessings be upon him, said: "The believer is not a slanderer, nor a CURSER, nor an an obscene, nor an indecent person." He also said: "There is nothing heavier in the Balance of a believer on the Day of Resurrection than good character. And Allah detests the obscene and indecent person." Especially if they are Muslims, for "insulting a Muslim is wickedness and fighting him is disbelief."