This post at Talking Points Memo is pretty much the essence of nut picking.  A taste:

Republican politicians have tried to pay homage on Facebook to the late Nelson Mandela since his death on Thursday, but many of their conservative supporters want to hear none of it.

Peruse through comment sections of the GOP’s Facebook tributes to Mandela, and there’s a good chance you’ll find plenty of vitriol for the former South African president and for the politicians who praised him.

Sen. Ted Cruz (R-TX) wrote that Mandela “will live in history as an inspiration for defenders of liberty around the globe.” One commenter took a different view of the anti-apartheid leader’s legacy, urging “all you Mandela lovers head on over to South Africa and see what’s going on now that ‘Mandela’s people’ have control of the nation.”