Using your race or ethnicity to try and appear superior to someone else of a different race even though you personally did not create the accomplishments or do not posses the abilities to do so.
Jonbob was race flexing when he mentioned that white people had better artwork, leaving the assumption that he could create better art, even though he is not an artist.
Shofia was race flexing when she boasted about her cultural food being better than white or black people's, although she cannot cook herself.