One branch of economists holds the view that monetary policy should not be influenced by any perceived financial market bubbles. An extreme version of this view is that bubbles probably do not exist - that rational market processes always price assets at their fundamental value.
A more moderate version is that even if bubbles do exist, they cannot reliably be identified, and even if bubbles can be identified, we do not know how they respond to monetary policy. The extreme view at the other end of the spectrum holds that central banks should pop bubbles as soon as they can.