I wouldn't call that a funny line, especially considering the context of Spellhold.
That's definitely supposed to be a humorous line.
In a mage with PTSD/Schizophrenia is completely within context and tone of the area. It may convey humor, but in reality is actually sad underneath.
The tone of the area is inconsistent. Spellhold is supposed to be an asylum and prison for mages, yet Tiax is parody character. A gnome with illusions of grandeour, never treated seriously by writers in BG1, and BG2 follows on that. Considering Dradeel was a mix of serious and humor in BG1 (his cookbook recipes), interpretations may differ as well.
