That is the way the "Thank You" threads work, as was explained. And believe me, your comment was FAR from the only comment deleted.
In the meantime, I would recommend that you reread the forum rules (
link), particularly the last two sentences of #12:
It seems you have been habitually violating this rule over the last few weeks. If you would like to discuss moderation further, my PMs are open, as are those of the other mods.