Alcohol and dairy?

What is it that makes dairy curdle in alcohol? cause I wanna make White Russians tonight and I have a 99 proof whipped cream schnapps and don't want to curdle my drink... I know some of you out here have got to be total lushes...
HELP!

Life is like a blind fiver. You never know what you're gonna get.
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Sorry about the lack of line breaks....
You're welcome.... ??
I like Oliva and Quesada (including Regius) a lot. I will smoke anything, though.