It's a combination of attitude and experience. First, do it with a very positive attitude. Be positive, happy, smiling, encouraging, eager, excited and enthusiastic. Be motivated and very much want to enjoy swallowing cum. Ham it up, talk dirty, be the best and proudest cum dumpster you can be. Realize that it's an acquired taste that you are going to acquire and enjoy. Second, make sure he's cumming regularly, at least a few times a week, and swallow every single time for at least a few dozen times in a row. Have him cum into your mouth, wait until he's done cumming, then swallow quickly and easily, then lick and suck his cock clean. Don't wash your mouth out right after swallowing. Instead, savor the cum that remains in your mouth for awhile. You will very quickly get used to it this way. Before you know it you'll be completely acclimated to cum and will enjoy swallowing and be very happy doing so. If his cum is salty and you'd prefer it to be sweet, have him eat a small can of pineapple chunks every day. I think that makes it too sweet and having him eat other fruits, like fruit cocktail creates a smoother more balanced taste.
I know how you feel. You pretty much described it perfectly. I hear that the taste is determined by what one eats and that eating pineapple can help with that. I don't know how valid those two theories are since I don't have first hand knowledge.
He probably needs to change his diet. At a minimum, he needs to drink 2-3 of the small cans of pineapple juice each day. Less red meat helps a lot. Less spicy food. More fruits and veggies.
Have a read of this...
www.yourtango.com/.../oral-sex-blow-job-road-test-how-food-drinks-affect-taste-semen
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make him eat a lot of pineapples
I hear if the dicks far back in your mouth you don't taste as much
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