Rex Tillerson Mum on Best Christmas Gift

Rex Tillerson was the last man out of the Trump transition office in D.C. Tuesday night -- lasted longer than the janitors -- so it's understandable why he wasn't playing ball with our photog who was clearly in the Xmas spirit.

Trump's nominee, the CEO of ExxonMobil, clearly has done or will be doing some Christmas shopping, so you gotta ask ... which is a better present -- a Starbucks gift card or an Exxon gift certificate?