Me too, am pretty slighted when people don't reply my comment because I took the time to comment. But from your post I now understand that it might not be deliberate if someone don't respond to your post. 

But I know for sure that some people are just mean when they do not respond to your comment. 

But for you I can say that you try your best to respond to all your commenters. You should be given an award for it. 😄