What incensed him the most was the blatant jokes of the ones that passed it all off as a jest, pretending to understand everything and in reality not knowing their own minds.
The character's outrage stems from the insincerity of those who joke about serious matters, displaying a façade of understanding while being utterly clueless. This frustration highlights the disconnect between appearance and reality, emphasizing how some individuals feign knowledge to fit in or dismiss important issues. Their mockery reveals a lack of self-awareness and depth, which further aggravates him.
This situation reflects broader themes of existential angst and the pursuit of genuine understanding. It suggests that true comprehension requires introspection and honesty, contrasting sharply with the superficiality of those who hide behind humor. Joyce uses this sentiment to critique societal norms that prioritize appearances over authentic engagement with complex thoughts and emotions.