In one of the curious passages of the Vedavicāra (written by Śāmaśāstrī Draviḍa Dvivedī) that I am editing, the author says that though the Gurjara's are included among Drāviḍas, other Drāviḍas do not have any educational, ritual or marriage relations with them, because like the Gauḍadeśa, there is too much anācāra "immoral behavior" among them, and like the Brahmins of Kerala, they were cursed by an Ācārya, and therefore, other Drāviḍas do not have any relations with them.  Here is the passage from the text:

यथा गुर्जराणां द्राविडान्तःपातिनामपि द्राविडैः सह भोजनादिसंव्यवहारादिकं नास्ति, तथैवाध्ययनादिकमपीति ज्ञेयम् । कुतो गुर्जराणां संव्यवहाराभाव इति चेदुच्यते । गौडदेशवद्गुर्जरदेशेऽप्यनाचारबाहुल्यात् तेषामाचार्यशापदग्धत्वात्केरलदेशीयब्राह्मणादिवत्संव्यवहाराभाव इति संक्षेपः ।