The depiction of the wickedness that forced God to destroy the world in the Flood is one of the things that the Picture Bible kind of fumbles because of its young target audience. Anything that normal people would think would be worthy of death isn’t gonna happen, so instead it looks like God just really hates parties.
(Though to be fair to the doctrine, any of these things being depicted — drunkenness, gambling, idolatry — are equal sins in God’s eyes to murder, rape, etc. Any one of them can, by itself, remove you from God’s grace. So, yeah, even according to the source material, these people are wicked and worthy of death.)