"From about <a href=""https://www.youtube.com/watch?v=98HZanvAJ8Y&amp;t=41m00s"">41:00</a>", criticizing something that's there instead of putting forth new ideas is a perfectly acceptable choice to make IF that criticism points out valid flaws in an idea and isn't just a "I don't like it" response. If you don't get that in your field, then you're ignoring valuable information just to save your theory.