Paano pag sinabihan ka ng anak mo na "you're bad mommy ! "You're bad daddy ! How do you handle this situation ?

Try to ask bakit nya nasabi na "bad"? Ano ang ibig sabihin ng bad para sa kanya? From there you can start explaining ano ba yung bad and ano ang tamang term for what your child meant. If s/he said it kasi may ginawa ka that make him/her feel bad, you have to acknowledge his/her feeling and say sorry din.