I can't control having my feelings hurt when people go out of their way to do so. I can't rationalize my way out of it. Sometimes I just have to feel emotions I don't want to feel.
I think there's a level of practice and analysis that has to happen: someone goes out of their way to make a cutting remark and you can recognize, with practice, that they're manipulating your emotions, or projecting their own feelings, or whatever. And of course some people are more naturally resilient than others.