God doesn't claim the 'perogative' to send most of His creation to the Lake of Fire because He is able to do so!
It was God's perogative to send His Son to die for His Creation (John 3:16)
If you Calvinists want to see what God thinks of His own rights read Phil.2:7-8,
but on second thought, why bother after all, what does the Bible have to do with Calvinism!
Stick to debate, not insults. We could (and some have) made the same accusations of your position. At the end of the day, where does it get us? You will never win someone to your side by insulting or belittling them.
Does God have the perogative as the self-proclaimed, "master potter", to make out of the same lump of clay (all of mankind) some individuals for noble purposes, and some for common use as he says in Romans 9:21? Or do you think he doesn't claim that perogative over all peoples?
It's a simple yes or no answer.