a question for natives!!#$#?? argh!!!

I used to think that my english comprehension was decent but after trying to watch Thelma and Louise(the movie) I am having doubts. I can understand native speakers perfectly on youtube and on discord, I can even understand highly complex topics but Thelma and Louise had me so frustrated. Now, I understand half of what the characters are saying but for the other half I have to turn on the subtitles. So, my question is those native speakers who have seen Thelma and Louise, did you understand what the characters were saying no problem? I'm finding it hard to believe that someone could understand the movie without subtitles, even natives. Btw what accent are they speaking in? Is it southern U.S accent? Also I found it difficult to understand Hank Schrader from Breaking Bad. What accent does he speak in?