it's a metajoke at this point
1) Zombz makes some dumb gag about demi being in a wheelchair
2) demi thinks zombz is weird and decides to take a few snarky shots of himself in a wheelchair
3) Zombz says LOLZ keeps on bringing it up
4) demi strings him along
5) internet doesn't know what to believe
6) demi thinks it's funny that everyone is WHA