If you were narsassistic then you would not be apologizing.
All you can do is share your experience. It's all you have to share. Try being honest with yourself in your shares. If you are responding to puff yourself up then take note. This is part of becoming more aware.
Good luck and keep sharing
I just retread the post you are referring to...sometimes we project, I have been guilty. The key is in the why. Why does a post bother you. If your being honest and can answer this then you are in fact growing and benefitting. This process needs to be two way, which is one of the reasons we hare.