Sometimes it’s useful to play dumb. Get your opponent to underestimate you. Make people comfortable, unintimidated, open up more.
But be sure to show some competence. Forrest Gump may have been slow, but he won the world table tennis champs.
It’s one thing for the crowd to underestimate you, don’t let it lose complete respect for you.
Downplay yourself, but maintain a smidgen of respect.