Ad Hominem Arguments.

What have these three types of people all got in common:
1) Christians.
2) People who think that the evolutionary hypothesis is fatally flawed &
3) Disbelievers in 'global warming' ?

Well. They are all liable to: abuse; ridicule; scorn; personal attacks; accusations of insanity and will all be shouted down or excluded unheard if they ever try to engage in serious debate.