The question Why you're laughing vs Why are you laughing? asks (paraphrasing):
Is the word order "Why you're laughing?" acceptable in colloquial spoken English?
The question African American Vernacular English asks (also paraphrasing):
I've attempted to write several sentences in African American Vernacular English; are these sentences correct AAVE?
On the face of it, these questions don't seem to be related in any way. The first question is a question about using "subject, verb" (SV) word order in a wh-question, and has nothing to do with AAVE. The second question is a question about AAVE, and has nothing to do with SV word order.
But if we dig a little deeper and look at the questions more closely, can we find a significant similarity between them? I think the answer is still no.
I brought this up in the comments on the first question. Edwin pointed out something I didn't know, which is that SV word order in wh-questions is a feature which is sometimes found in AAVE. But it's a feature which isn't even mentioned at all in the second question. In other words, nowhere in the entire thread of the second question is the topic of the first question even mentioned.
What's more, I really don't see how any question could reasonably be marked as a duplicate of the second question. It's a very specific question, asking if these particular sentences (written by the asker) are correctly written. The only way another question could be a duplicate of it is if that other question also asks if a particular sentence is correct AAVE, and the sentence is substantially identical to one of the sentences in the second question here.
But apparently 5 people, including a moderator, all saw a significant connection between these two questions that I have failed to see. What am I missing?