Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
Think of all the things you start to despise and to disdain. Now come up with some anecdotes (あなど) for each one of those things. Be sure to think in your head, "I'm coming up with anecdotes for things I disdain, why am I coming up with anecdotes?"
You shouldn’t make light of it just because it’s a child.