How do you deal with a know-it-all?

Answer 1

Just tell them how you feel and if they don't like that then maybe you weren't meant to be friends to begin with. She has to be told or she will never know or learn - that isn't to say she will admit it right away but at least she will be aware of her behaviour and attitude that its just not looked highly upon.

Answer 2

1. I think the best way to deal with a know it all is to simply listen and give the person a few minutes of your time and simply say "Wow you are really smart and seem to know a lot about everything! Have you considered running for president? Oh, bummer I just remembered an appointment got to go!"
2. additional. If you think they may not be aware of the effect of their behaviour is, then you could take them aside to a private space, and point out to them the effect of their attitudes. You may have provided them with valuable help. Confrontation is unlikely to be a useful technique.

Answer 3

Maintain humility and politeness when interacting with a know-it-all, while also setting boundaries and not engaging in arguments or competitions. Redirect the conversation or seek help from a mediator if needed. Ultimately, focus on communication and mutual respect to foster a more constructive dialogue.