Belittling

Tom and Mary took turns belittling the taxi driver.

Sami started belittling Layla.

The English teacher's belittling remarks hindered the progress and growth of foreign learners, stifling their confidence.

Online bullies targeted Rodrigo's achievements and talents, belittling his accomplishments and undermining his confidence.

I enjoy belittling other people's shortcomings.

And usually this manifests as them trying to prove their parent's criticism's and belittlings wrong.