So is intellectualism.
If one calls someone intellectual, it's surely an insult.
One can imagine anything that has nothing to do with reality. Thus we have religion, philosophy, politics, pseudo-science, superstition etc...
All things which serve no positive purpose in reality.
On can be intellectual, and postulate things long sinced disproven, and use incorrect assumptionary knowledge (which is NOT knowledge at all) to come up with useless concepts and claims.
Both of these, and there systems of religion, politics, philosophy, superstition, pseudo-science, serve no positive purpose, and are thus ANTI-HUMANITARIAN.