I am making a mug where I generated the handle with extrusion (ctrl + E). While everything looks fine in solid display, the handle looks weird in Material preview display once I apply the texture. Please see below screenshot. The edges between each faces are so obvious and the faces are just alternating with very similar colors, which is so artificial.
I attached all the .blend and texture files: https://drive.google.com/drive/folders/1Gn7SL3unDlbgAjpGWleE2wZ9O6pNGUXu?usp=sharing
Not sure if the modeling is wrong in the first place or I need to do a different UV mapping, or anything else? Any help would be appreciated!