Even in a professional setting, you are not obligated to coddle aggressive stupidity. That's how we end up in a world where nobody says what they mean, everything is just BS on top of BS, and nothing improves. Being direct, being honest, and being accurate are critically important in professional technical work, and while it's not necessary to be antagonistic, it is completely reasonable and socially acceptable to respond in kind to the energy you get. People who are aggressively stupid do not get a pass.