Gross' tweet last week was aimed at Carl Icahn's push to get Apple Inc. (NASDAQ:AAPL) to buy back $150 billion of its shares as soon as possible. He apparently thinks Icahn should quit meddling, and he's not the only one. Business Insider 's Henry Blodget also disagrees with Icahn, who has hinted that he may begin a proxy battle with Apple if the company doesn't bow to his demands.