People who say "I can't do math" are lazy? Sorry, but I think that's a gross oversimplification of the issue (which is also evidenced by the comparison to physical exercise) and the two assumptions fundamental to that opinion are just plain wrong. Namely:
> So what do people actually mean when they say that they can’t “do” math? Usually they are really stating one of two things. First, that they don’t like mathematics. Secondly, that mathematics is more difficult for them than other subjects, and that it takes a great deal more effort on their part to learn it.
He conveniently chose the two reasons that are easiest to dismiss (irony, anyone?). What he fails to account for is the fact that math education is so poor that many people don't truly understand what math is. Beyond arithmetic and algebra, they think it's some really complicated stuff with big numbers and funny symbols that geeky people with glasses do -- it's practically a foreign language to them, except it has a reputation for being much harder.
Why is this? If I had to guess, I'd say it's based on the fact that math involves a lot of critical thinking and critical thinking is very difficult to teach. Those who attempt to do so often do it very poorly, which leads students to the false belief that math is extremely difficult. On the other hand, it's very easy to teach someone to memorize formulas and plug in numbers, so that's what we're most often taught in math class. That's good enough to get us through the standardized test so we can graduate from high school, but memorizing formulas and plugging in numbers is not "doing math". So I believe many people are completely justified in saying "I can't do math".
What's more, people who "can do math" should be taking the blame for those who say "I can't do math" rather than using pointless semantics to wag a finger at them.