It doesn't matter. Belittling people never turns them your side.
It's utterly hopeless trying to communicate with climate change deniers. It has the opposite of the intended effect -- if you're the opposition and you're unhappy, they must be doing something right.
Some are honestly misinformed and can respond to new information, some will never change their mind and others are paid to be denialists.
It's worth responding to the first group, the response will indicate if they're really the second or third groups.