if someone online 'invalidates' what you say, how should you deal with that person

there has been times i've posted something online and someone answers and invalidates what i said, making out that what i said is false, when i know it's true...when someone does that it makes me feel really annoyed, but i get stuck to know how to respond, as i don't want to get aggressive, because then it's me who gets in trouble.

so what should your response be?

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Bleak · 36-40, F

Our thoughts are reflected in what we think and write.
And we don’t need anyone to resonate with our thoughts.

So better ignore them.