It seems to be a rather recent phenomenon here on HN (broadly speaking) and for me it falls pretty much in the same category as other overly familiar and rude language patterns such as 'AF' (short for 'as fuck') or 'tho', 'cuz', or 'w/' instead of 'though', 'because', or 'with'.

There is a rudeness in making it one of these faux-questions filled with implications instead of clearly stating what it is you want to say.