According to Socialblade (Yanno, that one website that tracks real-time subscriptions of Youtube channels) this video has made them lose about 12,400 subscribers since it was uploaded. Or nearly 68% of subscriptions.

…apparently they had a looooooooooot of bigots among their viewers.

I believe the figure he's quoting refers to a 68% decrease in subscriptions or something like that (as compared to some daily/monthly norm), not that they've lost 68% of subscribers. As of this comment, socialblade reports a loss of around 12,000 subscribers, which compared to their total of over 2 million is negligible.