Toxicity is a non issue compared the the huge disadvantage of losing anonymity. In fact you're feeding the trolls by giving them hints of ethnicity, gender, etc.

A real name policy also wouldn't actually address the actual problem. Toxic behavior is possible because on the internet you can write angry comments to a person on the other side of the globe and then forget about that person tomorrow. If that person does come back tomorrow then it doesn't matter if they are called "hahaurmom" or "Jonathan Willis".