They'd be about as appalled by ads for technology that lets parents lock down children's internet use as we would be by overtly sexist ads from the 50's, that take it for granted a hetero husband needs to control his wife's spending, not let her anywhere near the car, and administer corporal punishment to her.
They'd be as nonplussed by the use of "human" to mean "person" and "human beings" or "humankind" to mean "people" as many of us are by "man" and "mankind" being used to mean those things.
They wouldn't even bother to engage pretty much any of today's conservative or neoliberal talking points, since it'd be obvious to them that these are just excuses for why large groups of people don't deserve life or dignity. Because of this, they'd be accused of derailing or "playing the race card" or "making everything about your gender" if they actually tried to talk about this stuff.
They'd find modern cities about as frightening and unpleasant as we would a medieval town, with its rivers of sewage and excrement thrown from windows.
Their minds would be blown by the almost-complete lack of atheist churches and firebrand atheist preachers, and how Christianity seems to be serving that role instead.
They'd think our computers are hilarious and adorable.
Finally, they'd be very chilly, and need to find clothes to wear that aren't suited for swimming.