What I found was that he was just sensitive to change. It took him awhile to get comfortable with something but as soon as he did he would from then on resist any change. Anything that was different to what he was used to he hated.
In some sense, it makes sense. People should prefer processes over tools in many cases. If you have a process that works with one tool but doesn't work with a new tool then you might be better off sticking with the original tool. Broken processes can debilitate organizations.
When people say "I hate X" often what they are really saying is "I have a process to do Y that works for me but tool X makes that process too difficult". The problem is they just say "I hate X" so you never really hear about the process Y which provides the context.