So a winning President of a winning country invites them to the White House to celebrate their skill.
It's the chowderheads on the sports teams who say, "Yuck, I don't want to shake his hand - I'm not going" who devolve the whole celebration thing into politics.
Screw those people, and congratulate (and celebrate) these people!
Hockey, Pittsburgh Penguins.
Then they should be polite enough to simply stand at attention and snap a salute. He is Commander in Chief and I'm certain he would be polite enough to return the salute. Problem solved.