I have a few family members like this--not exactly with a hatred for Britain, but a disdain for anything not American. So they couldn't understand when I went off to live in London for awhile. To them, if ti's not American, it's crap.
I don't believe Meg likes or care about Meghan Markle, only that they share a first name. And of course Meg doesn't care about what members of Isis find funny. If it's not all-American politics, whiskey, guns, cacti and Real Housewives, she has no use for it.