A parent would not be proud of their child failing a multiplication quiz because it shows that the child has not learned what they were supposed to and hence it would imply that the parent has failed as well.
Consider the statement "I worked really hard with my daughter last year to teach her multiplication facts but last week at her quiz she failed.". Is the statement "I was proud when my daughter last week failed her multiplication quiz after we worked so hard together last year" false? Yes/no/unknown