There are good days and there are bad days. Unfortunately today sounds like a bad day, sorry man. as I've gotten a little older I've come to the conclusion that most people dont have a lot of empathy. It's unfortunate. But I too commend you for trying. Some days all you can do is try. If you have a relationship with your brother maybe you can talk to him about how comments like that make you feel. Might be an opportunity for him to grow a bit. My stutter ebbed and flowed too. Sometimes it's worse sometimes it's better. In high school and college it always got worse around the start of the school year and Christmas. Some things just have an impact. It's hard to say when you are walking the low points but...keep your head up. Things can improve. And they tend to do so. :)