Made a small change to make sure channel names are always lowercase (you'll have problems if they're not). Just to be sure, use /twitch instead of /join.
As a side note, mIRC's built in ignore functions work fine for Twitch.
Are you sure you want to unfollow this person?
Are you sure you want to delete this?
Click "Unsubscribe" to stop receiving notices pertaining to this post.
Click "Subscribe" to resume notices pertaining to this post.