Humorless Feminist

Like everyone, people frequently forward me dumb jokes that someone has forwarded to them, & on & on.
And often I’m offended by jokes that other people laugh at.
There’s this one, say:

A woman from North Dakota and another from the East coast were seated side by side on an airplane. The woman from North Dakota, being friendly and all, said: “So, where are you from?” The East coast woman said, “From a place where they know better than to use a preposition at the end of a sentence.” The woman from North Dakota sat quietly for a few moments and then replied: “So, where are you from, bitch?”

I understand that the joke is based on the woman’s rudeness, but I’m also tired of jokes about East Coast women, and educated women, etc. They tire me. I’m an educated East Coast woman, you know?
Don’t get me started on blonde jokes.
But what amazes me is that someone would actually send me these jokes. Not a stranger, either. Someone who knows well enough that I’m blonde, from the East Coast, and educated. Shoot, they even know I’ve taught grammar.
And I can’t figure out if this is weird passive-aggressive stuff, or if people just don’t think.
Either way, I get pissed off – probably more pissed off than necessary – and if I say anything about it (to the person, or to someone we both know) I get accused of being “too touchy” or “humorless” or “sensitive.”
Well, yeah, so I am. When people tell jokes that I’m the punchline of, remarkably, I feel offended. So sue me. But either way, it’s very hard for me to like the person who sent it much.