Social Democracy is less bad than neoliberalism, but SocDem political movements ideologically prefer to slide into neoliberalism than communism, so SocDems will never be anything except allies of convenience. By all means push SocDem policies for harm reduction reasons, but when push comes to shove, the SocDems will be on the other side (unless you radicalise them).

Or perhaps another way to phrase it is: if they're on the side of the revolution, they're (by definition) not a SocDem.