It's blunt ideological policing. Paul would not likely be the nominee anyway-too old and too rigid in his thinking. But he does seemingly take ideas seriously. This shunning is not really aimed at Paul-he's used to it by now. It's aimed at the next person that comes up talking like Paul does.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.