Spitting in God's face? Is God a psychopath?

I came across this statement today in an online debate which I was reading on the Scotsman newspaper's website:  “In the extremely unlikely event of me appearing before God on judgement Day, with only an insincere apology required to save me from the flames ... I pray I would have the moral courage to spit in his face” - quote from “Col Blimp III”.

First of all, it reminded me of a prisoner saying almost the same thing to me.  This guy was brought up in the church as a child but subsequently chose the path of violence instead (and has been in prison for a long time).  He told me recently that, were Jesus himself to appear in front of him, he would refuse to bend the knee, because God (if there is one) is unquestionably a psychopath.

But secondly, the statement I read in the Scotsman online debate just made me squirm.  I've been a Christian for a hundred years or so.  I find this kind of statement now hits me like a literal slap in my own face.  I obviously (well if it's not obvious, I'm sorry) acknowledge people's right to say these things.  If they think it they may as well say it, because God knows their hearts anyway.  I just cringe though when I hear folk say these things. 

The prisoner I mention above says that the reason he hates God so much  (although he's not sure if there is a God) is that God has the power to do good and save the world from the mess it is in but seems to choose not to.  Another point of view (mine, and Jesus's) is that God loved the world so much that He  gave His only Son, so that whoever believes in Him will not die but have eternal life.