Daddit - Parenting for Dads

Help me out Dads. My 4 year old boy has an annoying habit of repeating something indefinitely until someone acknowledges what he said. For instance, we're watching Groot videos and I called him "little guy" and my kid said "he gets big though" like 20 times before I ended it by saying "yep totally". I usually don't let him go so long but I wanted to see if he'd give it up.

Is this a thing with kids? Do they grow out of it?