A Misopedist is a person who hates/takes radical action against children or teenagers.
A person who dislikes or hates children is commonly referred to as a misopedist. The term "misopedist" is derived from the Greek words "miso," meaning hate, and "paid," meaning child. Misopedists may have a variety of reasons for their feelings, ranging from personal experiences to psychological factors. It is important to approach this topic with sensitivity and understanding.
If he or she hates money because he or she is afraid of it, the word is "plutophobe", which means someone afraid of money. There are very few words for haters, but they generally start with the prefix "mis-", such as misanthrope, misopedist, misandrist, or misogynist for people who hate people, children, men and women respectively. Apart from those four there do not appear to be any more special words for haters of things.