"To disparage" is properly defined as "to treat as unworthy" or "to consider negatively". Hence, an example-sentence that utilizes this term is as follows: "'If I disparage your work at first glance,' announced the art professor to the students, 'it is only because it deserves it.'"

disparage

It is important not to disparage others based on their abilities or appearances.

To disparage is to criticize. An example sentence would be: It makes her feel good about herself to disparage others.

castigate, disparage, reprimand, disparage