I'd have the following conversations with the player before you begin the campaign.
We are starting Out of the Abyss soon & there is a player who always wants to be the best character possible. I would allow it, but I don't think they deserve it as much.
1. They don't respect the DM's decisions.
In the past, you've had trouble accepting DM rulings during a session. During the game, whatever a DM rules needs to be respected. We can have a conversation after the game about the ruling, but during the game, it is too disruptive to stop the game to argue about a ruling.
2. They don't roleplay even after we have sent him videos about roleplaying.
We've also talked about the importance of role playing. We want this to be more than a strategy game. We want to have everyone play the role they decided to play. We've tried to provide some resources to help clarify what we mean. Role playing is an essential element in this campaign, and we want to make sure you're on board to participate.
3. He is on his phone, playing video games or talking while in the middle of a session.
We're instituting a "no non-D&D electronics at the table" rule for this campaign. No web browsing, games or emails. We understand if you get a text and need to send a quick reply, or if you get a call and need to step away from the table to take it. However, beyond that, and using online character sheets, etc... there will be no electronics.
4. He doesn't care about the enjoyment of the game for other players.
We've also notices some trends of you stepping on the toes of other people while they are role playing. This has made the game less fun for other players. We're looking for more respect for other players during the campaign.
5. He doesn't care if something bad happens to people unless it has repercussions for him.
We want everyone at the table to have fun. It should be all of us trying to make sure all of us have fun.
If you're going to participate in the campaign, we need to be on the same page. To recap: There will be no arguing with the DM, we expect each player to be role playing a character, there will be no non-D&D electronics used at the table, and everyone will be working together to make sure everyone has fun. Are these expectations you can meet? If so, we want you at the table. If not, then we're going to have you sit out this campaign.