Bed-wetters and the farmers' union

A letter in the current Straight Furrow cites a speech from Lord Christopher Monckton where he calls those who accept that anthropogenic climate change is a reality, "bed-wetters".
Monckton is presently touring New Zealand and is supported by the farmers' union, Federated Farmers.
They should be ashamed of themselves. I'm thinking too, of those people who wet their beds, against their own wishes, being used in a derogatory way. It's a disgraceful thing to say, especially coming from someone claiming to be a Lord, and to being intelligent.