Try staying on topic. The sarcasm was justified because you were indicating that Styrofoam was dangerous if exposed in a house. Your comment had nothing to do with birds.
As for the danger of Styrofoam to birds, the op indicated the Styrofoam would be to either side of the bird feeder, so unless the birds are pecking on the house, if wouldn't affect them. The site you gave was about bird toys; a block of Styrofoam that is part of building is not a toy to a wild bird and would likely be of no interest.