Alright... seriously then Stark
The way that will minimize his embarrasment and resentment, and maybe even appreciate you is to tell him in private that you used to have the same problem, then suggest a solution.
This works for all sorts of issues. Getting hotheads to keep their cool, people who are frequently late or unprepared, guys who flirt or fuck the girls at work inappropriately, etc. Admitting to having had the same problem (whether its true or not) will take the sting out of it for them. The downside is the guy might latch onto you so don't be too soft.
I don't want you to be embarrased about having to ask for management advice on Getbig Stark. In fact, I used to be a bad manager myself. That's why I wanted to talk to you about this. I know you're going to do better now.