Thats not true either. The minority is on both sides: auctions house advocats and your so-called anti-trading adepts.
The thing is, if there exists a convenient way to skip certain time-consuming tasks, like farming equipment, and if it is easily accessible in-game, like with an auction house, then the majority of players are likely to start using it, free from any prejudice. This has nothing to do with being pro-trade. Think of it it as the most efficient way to play the game.
The criticism is valid for a number of reasons.
If you are interested in the downsides of an auction house, read my wall of text in this post: Auction house in D4? Here are some major drawbacks