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Harassment covers a wide range of behaviors of an offensive nature. It is commonly understood as behavior that demeans, humiliates or embarrasses a person, and it is characteristically identified by its unlikelihood in terms of social and moral reasonableness. In the legal sense, these are behaviors that appear to be disturbing, upsetting or threatening. They evolve from discriminatory grounds, and have an effect of nullifying or impairing a person from benefiting their rights. When these behaviors become repetitive, they are defined as bullying.

No. Downvoting is expressing disagreement or disapproval, no one can use it to demean or otherwise attack the person.

From your own quote,

They evolve from discriminatory grounds, and have an effect of nullifying or impairing a person from benefiting their rights. When these behaviors become repetitive, they are defined as bullying.

Downvoting someone because you disagree with their opinion is discriminatory.

Reducing someone's rep below zero has the effect of nullifying or impairing a person's voice (free-speech).

When these behaviors become repetitive, they are defined as bullying.

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