I'm pretty grumpy myself... but I will say that I do not get notices that there have been replies to my questions on HF. I have to go to my subscribed threads to see if they have been updated. So sometimes it takes a while, or if I have a lot of subscribed threads, I might miss it, and sometimes, if I have asked the question quite some time ago, I don't always think of going to check on it. And yes, sometimes other things take precedence. I also don't get notices if I got tagged in posts (FYI, if you've done this and I haven't responded, that's why).
That said, I think that many are smarter than me, and know when to just ignore responses they don't like rather than reply in a way that elicits an argument and ends up attracting negative attention from our lovely moderators. So it may be that some ARE in fact, ignoring responses. Probably not me though, at least not intentionally. I'm too grumpy for that.