Hey man, I didn't see the posts till just now (time zones...), but I'm with you 100%. I've actually wondered about the same situation with me, especially in respect to some random shit in this weird country...if I accidentally consume nicotine will I reset to a day one quit? Honestly, the answer would have to be yes...
I wouldn't call it caving, though...only you really know if it was an accident or not, and that's not up to us to decide. Go back to Day 1 posts, post roll, and get on with your quit.
It is not insurmountable, and I have a feeling a lot of people are venting their quit anger on you....as well as some jealousy that you consumed nicotine and they didn't (face it, we all love nicotine...too much...which is why we're quitting). Don't give up on this system, I think it works (it has so far for me).
Post roll and get back with the system....don't let this set you back on your quit. It will be easier for you if you have the support here, and we all need one more person to quit with, I know I do.