I don't know why you really hate him, but the better to talk about the fact Ten Hag gave United two trophies in two season. How can you say he's a bad coach to lead leverkusen? He started with so many experience in coaching career, and not seeing this as a gamble by Leverkusen. Always being objective.
Everyone has their own judgment based on performance and maybe he sees the failure that happened at Manchester United when Ten Hag was the coach. If you look at it as a whole, there might be a difference because the Premier League is different from the Bundesliga so there is a possibility that Ten Hag could be better when he became the coach of Leverkusen. But I agree with LUCKMCFLY because competing for the title with Bayern Munich must be much more difficult, especially Leverkusen's condition after Xabi Alonso left and they have to adjust again with Ten Hag.