I'm not supporting fanbase Dreamgenders here (it took me so long to find out what they are, and I have never watched Dream, so I'm not allowed to have a verdict), but sources say that's not what it is. Then again, said sources are idiots on Reddit, but the Dreamgender idiots on Reddit say this:
Dreamgender: a love for dream/dream’s content/dreamSMP/all of those, to the point where it becomes your gender and a part of your identity. pronouns are dre/am/dream/dreamself