I will reply here since it seems properly fitting. Though definitely not in a Private Message.
Well that happens if you demand credit for anything, why cant you just have fun doing stuff instead of trying to license something inherently meaningless for yourself just because you made it?
You are not making any money off the Pack (if you do then curse is more fucked up and illegal than I thought), nor are you making yourself famous by trying to enforce a license, so the whole All Rights Reserved thing does not make sense for a Modpack at all.
I would recommend you to drop the “ask for permission” and the License thing, because it doesn’t make any sense to have them for something that is supposed to make people have fun, and also attracts lots of the poisonous Parts of the Minecraft Community (such as that racist asshole that humiliated you).
There is good reasons why I make everything under a Free and Open License, so I don’t have to care about shit that I have no valid reason to care about (such as people taking my stuff to use it for something else).