A reminder when trying to communicate with a blocked user
One of my Twitch friends inadvertently blocked me. He would send me whispers, but I couldn't reply. Every time I attempted to reply, I would see the message "That user's settings prevent them from receiving this whisper." It would be helpful if a similar message was displayed for a Twitch user whispering someone he or she has blocked - "You're whispering someone whom you've blocked. That person is unable to whisper back to you."
Also, it seems as though blocking someone from whispering automatically blocks receiving a DM from them. In situations where someone was blocked inadvertently, it would be helpful if it was a separate step to block receiving DMs from them.