I just mentioned it and sure many just react bad to whey no matter what but one thing I regularly see are guys drinking their shakes very fast. If you had 50g protein from meat you wouldn't knock it back and I especially wouldn't recommend it for a whey shake. I would combine your protein powders with whole food when possible and I would drink/take them slowly. Take 20 mins and chew the food you have with the shake slowly and allow your body to process things gradually. It should make a big difference. Now for the guys who just react bad no matter what it's about protein source and they may have to go with something different to whey (still drinking it slowly) or even blend foods if they want to drink their meal/protein.