Yet you don't understand what
he's trying to say. All he's trying to do is tell you that your "useful" business advice that will "help" in the long run is neither welcomed nor appreciated by him. In other words, for every additional message you post in this thread on your "advice," you are further alienating him.
Here's my helpful advice that will help you in the long run: Stop now. Just leave the thread. Don't even reply to this message, as it will only hurt your reputation. I respect you in general and have seen a lot of the cool stuff you've done in the Rubik's Cube FB group, especially the cube hat (kudos for that btw

), but in this case I think the wisest option is to just go somewhere else. Your words are falling on deaf ears in this case, but it happens to everyone. If he fails in the future because he didn't listen to you, at least you know you're not to blame. (I highly doubt that
will happen, but if it does at least now you know.)
Goodbye for now.