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This passage is meant in the sense that Jesus does not pray for those who have already rejected His message, not that all men are not called. No passage can be taken out of context of the rest of scripture. That God does call all men to repsond to the gospel, and as refutation of the Calvinist doctrine of limited atonement, there is this:

"My little children, I am writing this to you so that you may not sin; but if any one does sin, we have an advocate with the Father, Jesus Christ the righteous; and he is the expiation for our sins, and not for ours only but also for the sins of the whole world." 1 John 2:1-2 (RSV-CE)