What, no, this tastes great. Like a cola float. Bonus points for using whole milk. Do this.
Edit: I'm serious, soda has so much sugar you can't taste whatever this post is referring to, and the milk isn't actually spoiled so there's no harm in it.
Presumably referring to eggnog, Calpico (a japanese milky beverage), and Horchata (a mexican blend of rice, milk, vanilla, and cinnamon) being individually combined with Pepsi