Incorrect. The Mass was instituted by Christ, not men.
The way I think about God, is that an event which brings joy to his creatures, would be pleasing to God as well.
Joy is a passion experienced by created beings. God does not experience joy - God is joy and the source of all true joy.
Therefore, God might very well be leading the applause. Provided God has hands, of course.
I'm perfectly willing to consider the possibility that people may be moved to clap in Church as a direct movement of the Holy Ghost. But I don't think the Catholic clappers are amking that claim.
Catholics are not Holy Rollers nor do they talk in tongues.