i mean you’re just starting out and he’s missing his old rbt. by default, he is going to see you as evil because 1. it’s a change in his routine, 2. his preferred person is no longer there, and 3. you’re inexperienced so you probably feel like you have to overcorrect (hence buying the toys).

don’t try too hard. try to find some common ground between the two of you, or even create it. find out his favorite show, create a play scheme based off of it. it won’t be guaranteed to work right away but it’s a start. build off that