Of course it was a slap in the face to the US. Why not, plays well to his base, and the US public will take it and say thank you too. Eventually the US public will probably get sick of this warmongering crap, but not until things get a lot worse than they already are.
Three Turkish soldiers killed, 14 wounded in PKK attack in southeast, army says (Reuters)
from the article: Biden: East Jerusalem plan undermines peace talks