some people have an actual "allergy" to dairy and they associate this with "bloat"...
from personal expierince Milk makes my musles look less defined, but i also get congested from drinking dairy these days, so could easily be getting an allergy related to the dairy...
I agree that it helps bulking big time, its the cutting that it slows down me personally.
i acutally just found this fat free milk called, "over the moon", it has more protein and calcium in it so it makes the milk thicker, tastes great but still bloated me lol