Disparagement (noun)

1. The act of speaking or writing poorly of someone or something; the act of belittling or depreciating.
2. The state of being spoken or written poorly of; the state of being belittled or depreciated.

Origin:

From dis- ("not, opposite of") + paragement ("praise"), from old french, from par ("equal") + aisance ("ease, comfort").

Examples:

1. The employee was fired for disparagement of the company on social media.
2. The politician's campaign included disparagement of his opponents.
3. The movie was a subject of disparagement by the critics.
4. The disparagement of the minority group was condemned.
5. The disparagement of the new idea was not helpful.