Christians, don't you despise it when people commit blasphemy?

You know...like when people use God's name as a profanity or compare themselves with God? That just irritates me and makes me feel pity for them. I know as a Christian, I should be more tolerant of my fellow person...but blasphemy is like begging God to strike you down. I admit, I'm guilty of using God's name in vain also, but I immediately repent and ask forgivess. Many others don't even do this much. What do you think of unrepentant blasphemers?