He said he's not going back to Ambassador, unless he"s reconsidered.
German's were all happy and shit until Grenell tweeted back, "Wait till you see who"s coming next" (Or in that vein).
Ric also tweeted to someone bitching about how all the former Ambassadors were nice, "Try paying your NATO bills and nixing Nordstream2." "You're just not used to an Ambassador doing what the Americans he works for want him to do." (again, or similar).
Love it.