What are the inherent or learned behaviors that contribute to Grenouille's disregard or hatred of humanity?

Grenouille's hatred of humanity, while not surprising (considering his upbringing and early adulthood), is so complete that he retreats to the farthest point he can to get away from the smell of human beings. This takes the form of a seven-year hermitage on the top of a volcano in the Massif Centrale in what amounts to solitary confinement. He retreats so far into himself that the only thing that matters to him is his own very pathological fantasy life. To call this a hatred of humanity is an understatement; Grenouille tries to be the only person in his world. Once Grenouille has concocted his ultimate scent, which is the scent that inspires love from all other human beings, Grenouille finds that he has no use for this love. It doesn't fulfill him. Since he has no more "(scent) worlds to conquer"--as Alexander the Great was said to weep when there were no more countries for him to conquer and add to his empire--Grenouille is ready to die. Nothing in this world other than the pursuit of scent has any attraction for him; no human being holds any interest or love for him (or he for any of them other than scents to collect), so he decides to die. His final rejection of humanity and life goes beyond a hatred for human beings and extends to himself. Grenouille is perhaps the perfect misanthrope.