I can't answer for another man, but if I read his statement about blasphemy, it was specifically in regards to those who say, that God chooses willy-nilly who is saved or not.
Now, whether a man believes in unconditional election or not, it would be a very serious thing to accuse God of such actions. Calvinists do not say that. They claim the basis of God's election is to be found within Himself, that is, according to the good pleasure of His will. Even Calvin did not attempt to state what that was! Just that it was so because that is what the Word says.
Reading the posts on this subject in this forum has made one thing clear to me. The majority who are posting don't understand their "own side" very fully, let alone their opponents!
I used to be a strong anti-calvinist, and even taught against it. Until the Lord moved me one day to set aside all my preconceptions (from dispensational and Arminian/semi-pelagian viewpoints), and just read the Scriptures. I came out of that 1 year process a fully-convinced person of the validity and scripturalness of Reformed Theology, and have taught apologetics classes in my pastorate for many years now.