A man labels a woman in some slightly critical way, hoping she'll feel compelled to prove that his opinion is not accurate. "You're probably too snobbish to talk to the likes of me," a man might say, and the woman will cast off the mantle of "snob" by talking to him. A man tells a woman, "You don't look like someone who reads the newspaper," and she sets out to prove that she is intelligent and well-informed. When Kelly (an example de Becker was using) refused her attacker's assistance, he said, "There's such a thing as being too proud, you know," and she resisted the label by accepting his help.
Typecasting always involves a slight insult, and usually one that is easy to refute (in our case, the insults include Islamophobic or racist). But since it is the response itself that the typecaster seeks, the defense is silence, acting as if the words weren't even spoken. If you engage, you can win the point, but you might lose something greater. Not that it matters what some stranger thinks of you anyway, but the typecaster doesn't even believe what he says is true. He just believes that it will work.
The Gift of Fear is an excellent book with many useful insights into our resistance against the manipulative attempt to Islamize our countries.
Read full lists of manipulation methods from the book: