The people most worried about pension fund are the pension fund managers. If their funds are heavily invested in BP, their yearly results will be awful, and their bonuses will suffer. Barack Obama has probably made some revoltingly rich people not quite as rich as they would have been. But an individual's pension is sculpted by economic events and decisions taken over decades.
As far as I can make out, a few fund managers have been whingeing. Plus Boris Johnson, but if he's going to be taken as representative of Britain, we might as well sever all communication with the outside world. The man's a buffoon, and an idiot, and a bumbling fool, and one of the problems with the internet is that the nonsensical statements of people like him are seen by outsiders who haven't had previous experience of their behaviour.