I heard “me me me” from the OP. There is no context or direction that it is a bad manager. What if OP is a bad employee and a drain on company resources? It is a one-sided talk so far with no context on the other party.
Context is very important here. Have you always been denied for every talk? How frequently are you planning these talks and does it impact you work? Is there any trade secret/ IP the manager is concerned about? Is the company paying for everything and if so what are you giving back?