Why cant you mix red bull and milk?

[Marshalscienceguy]

Apparently you cant mix red bull and milk. However you can mix ice cream with root-beer/coke/any soda and I have heard of people mixing soda(pepsi) with milk and drinking it. Apparently they also make chocolate milk Vodka. So why exactly cant you mix red bull and milk but you can do all these other combinations. I understand the process and that it make the milk clump and separates the protein but why does this not seem to apply in any other instance?

Edited April 8, 2014 by Marshalscienceguy

[Enthalpy]

Isn't it a matter of acidity? Lemon juice for instance lets milk clump.