Responses
The logic :
I'm not the strange one cuz I ate your loved ones, you are strange cuz u want to kill me because of that
Having said that .... would you think a cow or chicken is strange if it chased you to the ends if the earth because you ate it's loved ones? Im sure you would think wtf is wrong with this chicken. Maybe Muzan sees humans as just livestock.
Yeah maybe
you're literally a murderer who eats people you should be the last person to say someone is "abnormal"