What is the definition of the Word Redneck by todays Standerds is it the same as calling a whiteguy a Niggga?

What is the definition of the Word Redneck by todays Standerds is it the same as calling a whiteguy a Niggga?
The Dictionary meanings are
Offensive Slang
1. Used as a disparaging term for a member of the white rural laboring class, especially in the southern United States.
1.an uneducated white farm laborer, esp. from [...]

Why is it acceptable to use terms like redneck and white trash but not the “n word”?

i dont understand why. I thought they were equally offensive. You can ask a question on this site using redneck, white trash and hillbilly without anyone complaining at all,,, but if you say nlgger, your account is immediately suspended and you could have death threats!