You asserted, without evidence and in absolute terms, that the manager is trying to "sabotage" OP's career, advocated that he quit his job, and that the manager is "bad" and "selfish." That's a lot of assumptions based on four short sentences.
All we really know is 1) OP wants to give a talk at an industry event and 2) his manager asked him not to.
Yes, there seems to be a disconnect—on the OP's side. There may be one on the manager's side also; we don't know. It is also not the responsibility of the manager alone to make the relationship work. People have their own interpretation of events, and ultimately none of us commenting knows what efforts the manager has made and what OP's interpretation of those efforts was.
All we really know is 1) OP wants to give a talk at an industry event and 2) his manager asked him not to.
Yes, there seems to be a disconnect—on the OP's side. There may be one on the manager's side also; we don't know. It is also not the responsibility of the manager alone to make the relationship work. People have their own interpretation of events, and ultimately none of us commenting knows what efforts the manager has made and what OP's interpretation of those efforts was.