I may only speak for myself, but basically, it’s not “disliking” the war per se. The ACW has been done to death, is what it is. There is and has been TONs of books and everything about the ACW.
So myself, I care less about the ACW (I went to about every battlefield as a child) and WWII as the most popular wars. The wars more forgotten hold more interest for me.
That’s great. There are so many facets of history that bear closer scrutiny. In my case, even those that have received greater attention as a result of proximity in time are in need of better study and understanding on my part. The Battle of Themopylae presents a sound subject in its own right. Which wars and battles are of particular interest to you?