People throw out the phrase "Judeo-Christian values" without really understanding what it means. They often seem to just mean "Christian values", and sort of throw out the ways that some Jewish traditions differ from Christian ones:
The nuclear family vs multigeneration homes — Jews do sometimes live in single-generation home, but they don't tend to look down on multigeneration homes like American Christians do. [1]
It suggests a certain amount of unity and continuity between Jews and Christians that is simply a myth.