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> “Dude …” is a dumb thing to say in a debate.

Is it insulting?

As a part of a retort in an argument, it’s similar to rolling one’s eyes. It’s also not substantive.

No, but it is annoying and when in a debate it tries to distract and/or claim some kind of familiarity or higher ground.

The comment I replied to had already lost any sort of higher ground at:

> stop thinking like a poor person.