David sees himself as the father and any human host as the mother of an alien, the egg was waiting for a host to respond. An alien host serves the purpose of a mother by being used to give birth to the creature. I would say David sees the mother role as beneath the one of a father, his conclusion through his own experiences with humans; Weyland, Vickers, Shaw.
To him the alien puts any human in a passive and emasculated condition, like the one he was forced to be on, he was pretty much Weyland's housewife, thus the creature presents the perfect revenge he wanted to use against humans.