Earlier quoted context omitted.
Everybody, without exception, can be conned. Smart people are no more resistant to it than anyone else.
"Smart people are no more resistant to it than anyone else" Absolute statements are very rarely correct.
The reason smart people are no more resistant to being conned than anybody else is because conning people is an emotional approach, not an intellectual one.
Any given specific con may not be one that will sucker everybody (in fact, it certainly won't), but con artists tailor their cons to their target. The one a smart person will fall for is different than the one a dumb person will fall for.
As Brian Brushwood says in his excellent podcast "The World's Greatest Con"... "We don't get conned because we're stupid. We get conned because we're human."