John Chrysostom (d. 407) preached eight sermons entitled Against the Jews. In this, he took the rabbinical position that Christians were not Jews so they should stop acting like Jews! Why would Christians who by this time would have something of a basic theology developed (at least the first Nicene Creed) need to still remain on friendly terms with the Jews? This was, after, near the end of the fourth century and the beginning of the fifth. (For background on asking these questions, see here.)
An excellent article on the relationship between Jews and Christians at this time is written by Wolfram Kinzig, entitled, ‘Non-Separation’: Closeness and Co-operation between Jews and Christians in the Fourth Century (Vigiliae Christianae, Vol. 45, No. 1 (Mar., 1991), pp. 27-53).
His four groups are interesting, as his his paper. It is well worth the read.