While what you are saying might be applicable at other times, it does not follow that inflation can only be caused by things good for the working class.
Current inflation seems to be the result of an ongoing housing bubble, and other mandatory finance-based expenses. This is decidedly bad for the working class, or really everybody who doesn't already own the inflating assets.
This inflation also seems like the direct result of the overt policy to erase the natural deflation of manufacturing and technology to keep everyone working "full time", when human labor is needed less and less.