Now that he’s no longer working in the White House, onetime Obama speechwriter Jon Favreau is free to say — or tweet — whatever he wants. And he is. Friday, Favreau, who was born in Winchester, lived in North Reading, and graduated from Holy Cross, tweeted a list of what he doesn’t like about Republican presidential candidate Donald Trump. It included “Trump . . . Is a d**k.’’ Favreau also alleges that Trump “profited off of 9/11,’’ “rooted for the housing crash,’’ “ran a fraudulent university,’’ and was “sued for tax dodging.’’ Favreau left the White House in 2013 and launched a communications consulting firm — Fenway Strategies — with Dedham native Tommy Vietor and Ben Schwerin, who’s from Wellesley.