At this point I don't even care about helping Belt to at least give a decent fight for any Warlock hate.

I can easily see a world where mages have rain of fire and locks have a variants of blizzard(aoe corruption type dot with talented slow?) In this world he would just as quickly go on about how rain of fire is better than corruptizzard because it just blows enemies up - which is his typical fire mage argument

At this point it seems to me that he is deluding himself and projecting any shortcomings of the mage class onto warlocks(granted, I may still be looking through TBC colored glasses where they were notorious whiners. )

To go roll a half-hearted attempt at another class and then go through a number of increasingly elaborate suicides with that character will understandably make you realise that character and by extension, class, but basing your entire view of that class on the character?

I have both a mage and warlock at 80 and love playing on both and while I like seeing some 'friendly' rivalry between the more purist players, it gets really tiring when someone degrades to infantile "you're a doodie-head" insults.