I can't blame Bruce being about toxic masculinity on Tim, at all. That started with Jason and Dick, not Tim; remember how originally Bruce fired Dick because he wasn't working as his partner as much anymore, and just replaced him with Jason before even doing so? Yeah. That's the definition of toxic masculinity.

I also don't agree with the idea that Tim just doesn't work as a solo hero. While his career with Young Justice and the Teen Titans have defined him he also spent a lot of time on his own during those eras; he has had the only actually successful Robin solo which spun off into Red Robin, which as bad a codename as that might be (and Tim wasn't the first to have it, Earth 2 Grayson was) the run was really good and successful and defined Tim as being able to be his own hero.

That's probably where a lot of the issue comes from, though; as much as Tim was Bruce's partner he was also his own hero. He was never defined by being "... and Robin" or by being just another cog in a team wheel. But that's all that he's been since the New 52.