I don't run any OSS projects myself, but I can't imagine anyone would fault you if you called-out people who demonstrate the behavior you're describing. If not

I don't run any OSS projects myself, but I can't imagine anyone would fault you if you called-out people who demonstrate the behavior you're describing. If not a direct response to their rudeness, maybe a request that they comply with some basic guidelines when posting issue (guidelines you'd of course have to post). I think this gets you unquestionable justification for declining to respond to rude questions, but it also serves as declaring norms for people who may just be ignorant to OSS norms (or even regular social norms).