

The main thing at this moment is not to make excuses and not to get irritated: folks, it's impossible to know everything. Instead of getting defensive — turn the situation to your advantage: "Now I'll get to learn a lot more from you" or "Thank you, I'll make a note of that."
What happens? You defuse the tension and remove the manipulation. As a result, you remain in the position of a strong and confident interlocutor.
Most importantly, remember: it's okay not to know. But allowing yourself to be drawn into making excuses is a mistake.