if "endorsing" is the problem, then the target of your starve-of-attention campaign should be the person [...] But my impression was that wadavis was talking about ignoring ideas.

If the problem is that people endorse the idea then starving the idea of attention might be a reasonable approach. The aim would be to reduce the number of other people getting persuaded to endorse the idea, rather than to change the minds (or destroy the credibility) of the people already persuaded.