Meh. This "one-two" thing seems disingenuous. It's good to be slightly self-deprecating in the sense of knowing what you don't know and having a sense of humor, but presenting oneself as an idiot is just dumb. I think it's best to take the attitude of, "I'm good, but this person might be smarter, or at least know something I'd benefit to learn".
What I think smart people could be better at is separating stupid ideas from stupid people. Most smart people have stupid ideas on occasion, and I've certainly had my share. It happens.
I wish I could agree with you here, but there's a lot of distrust of smart people especially in some parts of the US. If you are immediately and obviously smart, some people will tend to think you will use your intelligence to trick or manipulate them or that you have a hidden agenda.
It's unfortunate, but it does make sense to view someone more intelligent than you with a little bit of suspicion if they're trying to persuade you of something. The reason is that if they're trying to trick you, they have a head start due to the disparity in intelligence. Of course, someone with superior social skills is even more dangerous in that sense.
What I think smart people could be better at is separating stupid ideas from stupid people. Most smart people have stupid ideas on occasion, and I've certainly had my share. It happens.