Winning a debate isn’t about proving the other party is wrong. It’s about proving you are right. In fact it’s about proving that you are more correct, even a little bit.
Although that’s a nice tip, debating is hardly the approach we need in any part of a startup business. The best advice we can give here is to never enter a debate, and let the other party believe they are right. Startups are about building relationships, not sabotaging them.