Like I said, it's second nature for us to jokingly call one another out on misuse of language or spelling and grammatical errors, but for someone who's new to the place, it can come off not in the playful ribbing way it's meant, but as an attack.
It puts us in a bad light because it looks like we get new members and then spit on them for making a couple easily overlooked mistakes when it's just that they don't understand the full context of why we ribbed them.
Some black folk will let their white friends drop the n-bomb around them in conversation because it's all in good fun, but you wouldn't (I assume) just walk up to them on the street and say it not knowing them.