initially the founder had issues with an old project member, who founded copperhead os, a competing rom. allegedly he took all the code from graphene for use in copperhead, without attribution, and it even involved money some way. these two were suing each other for a long time, there was brigading in chat rooms and forums and whatnot. then somehow the rage extended to other projects too, like f-droid and calyx os, which they also accused of brigading and more, so that anyone mentioning calyx os in graphene rooms gets banned from there on sight.

I don't have enough information to be certain about which projects were actually hostile to graphene and which not, but people have been calling the graphene founder paranoid for thinking everyone wants to destroy their project. the founder was writing a lot on twitter and other places, mostly (but not only) with tye official graohene os account. he stepped down from being the project leader a year or two ago.