Ugh that sounds sooooooooooooooo frustrating! Especially when you have issues you're trying to deal with yourself. he sounds very insensitive and very blind to the fact that you are going through a tough time. Have you tried picking a time when he's not on everyone's case about something insignificant (if that time ever comes :P) and just sitting down and talking to him? Or maybe it would be best to talk to your mom and sit down together with him? In a way, it may almost seem like an intervention because he obviously has problems himself that he's not not dealing with.