Is it possible to give a negative opinion without being considered the bad guy or a mean person?

why does negative have to always equal bad?

For example "Does my siging sound good?" many people say yes, and one person says no. so everyone gangs up on the one person saying "you are a jerk" "you didn't have to be so mean"

How can you simply give a "No" without it being considered mean?
Is it possible to give a negative opinion without being considered the bad guy or a mean person?
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