About 12 years ago I set out to lose 165 lbs which I did. I also kept it off and I recently started a serious weight training program with even a better diet than I was doing before.
Anyway, I know exactly what you are talking about. Even now there are those around me who scoff at the protein shakes, protein bars, my dedication not to eat junk, etc.
What I do is simple: I tell them that I like doing what I am doing and they are free to eat and live the way they wish. I stay on my program, and like you, I plan my cheat meals with care as well.
Bottom line is that you are the only one who can control you. People that never had an issue with food cannot really understand where you came from, even though they may have seen you change right before their eyes. Also, in my opinion, some if not all of them are jealous.
Keep it up!