A person who identifies with, or has loyalty to a tribe or similar group (noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "tribalist" in a sentence
"The fact that this may be tantamount to a 'tribalist' for some is a sad commentary on our willingness to be exposed to that with which we disagree."
"Jerry, a Ndebele in his mid-20s who calls himself a "tribalist" says he hates the majority Shonas as well as a few Ndebeles - the leaders of the former Zimbabwe African People's Union (ZAPU) who united with the Shona-dominated ruling party after the killings."
"All of this segues into the "tribalist" stuff that I'm going to have to write sometime; but not now."