Did you Calvinists have a meeting to toss this thread in every direction? Do you consider yourselves called of the first group, who were rejected by the king, or the second group, of whom, some were also rejected? Either way the 'calling' does not indicate, nor assure salvation.
And this does not fare well with your interpretation of Romans 8:30.
Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified.
So, I say this parable does not support your theology either.