I have been dropping meta alloys quite frequently (maybe a damaged escape pod or two... I'm not inclined to drop occupied ones though), further encounters have shown that the instance of an interceptor ignoring my cargo (not turning hostile after scan) was probably a one off. The interceptor likely found something else in the NHSS more interesting than the couple of alloys I had (or it just bugged out).
However, all further encounters, with new interceptors (so far no repeats) have been green on contacts right after scan. As for my behavior, I've never fired upon or rammed an interceptor, but I have had to run off after crossing the hostile threshold twice. Of those two instances, I upset one by not dropping a Thargoid Probe (even after reversing away), and the other, I was thrown several kilometers away by the warp-in of a backup interceptor (after dropping 5+ MA) and upon boosting back towards them, triggered a response.
Whether it is deliberate friendly behavior or just a contact menu bug, I doubt my relations with them have been consistent enough to suddenly be friendly with the whole race. Other than one example out of at least 10 instances, their behavior is no different than any I've seen. I'm downloading the update right now, I'll hunt down some more NHSS's and see if anything has changed.