Naysayer

He ignored the naysayers and succeeded with his idea.

As for the IRP, Secretary of State Grant Shapps continues to peddle snake oil, smoke and mirrors. His reaction to near-universal IRP condemnation from politicians, local and national media, and all but a few rail specialists was to dismiss the lot of us (in the condescending and patronising tone we have now come to expect) as "critics and naysayers".