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.
Yeah it's not great but it's not gross, I used to do this as a kid too. My brother and I learned about them from a restaurant that called them Jolly Rogers. Like op said it essentially tastes like a warm float.