I have a mate who used to be scared of cows, really terrified, he couldn't even look at a cow without being reduced to a gibbering wreck. But then one day while he was eating his sunday lunch he realised that he was eating one of them and so they should be scared of him not the other way round, having realised this he went into the field behind where we lived which was always full of cows, walked straight up to the biggest ugliest cow and punched it in the face, and from that moment he has never been worried by cows.
So I used a similar tactic to try and cure my phobia of spiders, as a fellow sufferer you will know what I mean when I say you get the feeling that a spider is trying to stare you out. Anway the next time I saw a spider staring at me I just walked over and killed it. This pretty much cured me.
Spiders just think they are the Kings of the world with this hold they have over some humans, once you kill a few then word will get round the spider grapevine that you are not a human to be messed with and then you will have nothing to fear.
Now I'm not entirely sure that spiders have such complex thoughts and networks but it helps to imagine that they do.