Redneck /red.nek/ noun [ C ] mainly US informal
A poor white person without education, especially one living in the countryside in the southern US, who has prejudiced (= unfair and unreasonable) ideas and beliefs
Some synonyms =>
Sense 1) caipira/simplório/rude/rústico etc
- backwoods man/woman/person
Sense 2) obstinado/teimoso/quadrado/obsoleto/arcaico/ultrapassado
- Inflexible/die-hard/orthodox/obstinate/unchanging/fogyish/unprogressive/traditionalistic/guarded/conservative etc...
Generally pejorative, at least 99.99% of the times.
Ref. Cambridge Dictionary