Ronaldo does not hate Manchester United and also other teams in any League, but after seeing the news about his contract extension in the Saudi Arabian team, of course it has given a signal that he is still quite focused on his football career as an active player on the field and maybe still doesn't want to think comprehensively about having a team and making any renovations. Especially if the team is a team that once made his name big because basically the Manchester United team is a fairly big team in the Premier League.
Buying Manchester United isn't going to be an easy thing for anyone including Ronaldo, it's not as easy as it may sound, firstly there have to be an intention from the current owners to be willing to sell it before they can further proceed to actually getting it done which will still involve a lot of process. I am not saying he does not have what it will take to buy the team but it is not just about buying the team of which will involve many processes, he will also need to take on some major reform to get the team to becoming a top team again in the English Premier League, by the way they are still regarded as a top team even with their poor performance in the just concluded season. Manchester United can do better in coming seasons, it does not have to be until Christiano Ronaldo buys the team.