I've found otherwise, in my experience. I didn't dip my shoulder, but I did develop a tendency to drop my hands at the plate if I was also playing golf at the same time. Dropping your hands is a flaw that can easily carry over from golf, especially if you also bar your arm (I didn't have this issue, but a lot of high school hitters do). I mean, what do you do with your golf swing? Your "guide" arm is basically straight, and then you bring your hands down. Big no-no for baseball.
Once I ditched golf in high school, I improved greatly in baseball. I admit I was never the most athletic guy on earth. I was a self-made athlete, not exceptionally gifted. And I could always do well at one if I focused on it, but wouldn't do very well at either if I was doing them at the same time. I chose baseball in high school, now that I'm no longer a player, I focus on golf.
Why would you drop your hands because of golf? You start with your hands lower, granted, but why else?