I'm 9 months out from WLS and I've been following this forum since January 2023. I can't count the number of posts here of people struggling to drink protein. I consumed a lot of them before ever having surgery. Back in my weightlifting days. Maybe it's an acquired taste sort of thing but never had a problem with them except for a few premade ones tasting too sweet. Food/drink aversions are pretty common post-op though. taste buds change etc.
I can't help but wonder, when using the powders... if tasting chalky, use a good blender. I have a Vitamix and even the cheapest protein powders taste good. I tried Walmart's Equate Whey Protein powder for $18/18 servings. If you are mixing with a spoon or shaking in a cup, even the best powders will taste chalky.
I buy vanilla or unflavored powder so I can change up the taste by adding frozen fruit, SF various flavor Greek yogurts, peanut butter or cocoa powder, Crystal Light or stevia to sweeten. I like to use milk and ice. It comes out tasting like a milkshake. Strawberry being my fav. Experiment to find what you like. Variations are endless and beats drinking the same premade ones day after day.
GL on your weight loss journey!!