A reference to a type of old-time slapstick humor reminiscent of serious but clueless people slipping on banana peels, causing a surge of wildly insensitive hysteria on the part of onlookers.
His whole being, starting in his early youth, was rooted in banana slapstick reality and this caused him to feel like an alien in this day and age.
I did a line earlier, oh my God it was so good, oh wow, I did a line, but not just any line, it was a super long line, it was the length of a shardstick. Is there an ice pick sticking out the back of my head?