Personally, I think Guiseleys are in the right. The bloke looks up to where the keeper is and punts it towards him. Any keeper worth his mettle would move towards the ball to try and get it, not stay where he was and then look peeved. He is far too much to blame. The Guiseleys lad raises his arms, but it's more a baffled celebration than anything else.
The fact is, the Guiseleys management should have done the honourable thing and let Braintree walk the ball in. Not unprecedented at our level when Frank Gray (I think) told his keeper to let the oppo walk the ball in after something similar happened when his Woking(?) side had something similar happen to them.
The player is not to blame for the goal. The management is to blame for not correcting things within the spirit of the game.