Adventuring party allegory for workplace sexism? I am extremely into this.
It's exactly that.
I suspect that commenters who complain about "unrealistic asshole male characters" don't realize that all the male characters in this story are very realistic portrayals of the sort of men that populate every workplace in Japan.
It gets even more transparently obvious in later chapters, when we find that being an adventurer involves a hell of a lot of paperwork: the Adventurers' Guild expects every party to fill a ton of forms, records and documents detailing every tidbit of info about their quests, their travels, their fights, their individual performances, etc. Ryan's party will get in big trouble because of this, as for the last five years they had been pushing all their paperwork on Tanya; and, with her gone, nobody knows how to deal with the guild's bureaucracy.