Dane's memorandum generated considerably arguments almost the whole of office last week. He may have implied pleasingly, but his typical sardonic tone humiliated virtually everybody. He has evolved into a constant annoyance at work and is likely to get fired.
The writer emphasizes Dane's practice of annoying co-workers at job. He has "offended nearly everybody" and is a "constant annoyance." The writer finalizes that Donna will get terminated, suggesting that he's had enough of his situation. The expression exasperated means that the writer has attained the
limitation of his tolerance.