I try to always be nice, that's what my channel is about and they don't expect people to stay nice when they are being an ***, gets them off their game.
This is on a video about making something out of cardboard for your cat.
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My advice: don't let it get to you, count to 10, and then reply

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I agree on this, but I like to block their negativity by being positive in return

It completely ruins what they were trying to achieve

Plus I like the message I send to other people reading it, since in real life you can't just delete these people.