According to Nookipedia, you’ll need to reach maximum friendship with both a peppy (mischief) and smug villager (showmanship) to get the reactions. If you have either type on your island, keep talking to them and gift them things to boost your friendship.
Katrina can help as well in a way if you have her trailer on Harv’s island. Pay her $1,000 bells to get your status for a villager, and if it can be boosted, she’ll request another $10,000 bells ($11,000 total) to help boost your current level. This can only be done for one villager per day, and you’ll still have to talk and be nice to the villager for it to work properly. You also have the chance to get good friendship luck if you pay another $1,000 bells and she reads it off to you. It’s completely random; If you get bad luck, pay $10,000 bells to remove it, otherwise the level will never go up.
The chance of the villager teaching you the reaction will still be random. These tips only boosts your chances.