The fact that a black man and white woman were competing to be president in 2008, and both had much better chances than the white military veteran.
The tolerance of homosexuality would also be surprising. I’m sure all the electronics we have everywhere would also intimidate them.
Political shifts would probably be surprising in the 1950s the south was mostly democratic and the northeast and west were more republican. Now the south is almost pure republican and the west and northeast are almost pure democratic. It’d be like going to 2059 and finding New England and California are GOP strongholds and Alabama the heart of the democratic party.
Probably the advances in robotics too. If I see a guy who has lost his leg walking with a robotic leg, I do not find it surprising. but I’m sure someone from 1959 would find it pretty weird.
Food selections too would probably take some getting used to. A grocery store and restaurants have far more options than they used too.
The fact that China is now on the way to becoming a global superpower would probably be weird too. I’m guessing/assuming it’d be like finding out 50 years from now that various African nations had bonded together and become an economic and political superpower.