I have lots...such as White Fang, The Call of the Wild, and Emily of New Moon. I don't like it when the author makes their main character very unsympathetic and then expects you to think "The injustice of it!" when something bad happens to them, or think "Yay, good for them!" when the aforesaid main character snubs someone.
Or any book where the main character is the author's Mary Sue.
Least favorite dessert?