Re: called a "nut"
Your DH is a nut if he thinks that being so insulting to you about something you care about is in any way useful to you, or to your relationship as a couple.
That being said, other than letting him know that he was being a jerk, I would leave the extended breastfeeding issue alone for now. Your baby is still really young, and your DH probably can't quite envision what she'll be like a year from now, or how much of a baby she is still going to be, or how much she's still going to need to nurse. A lot of guys who think extended BFing is weird really come around at the 12 month mark, when they realize that the baby is still a baby, and that breastfeeding makes their lives so much easier. What dad is desperate to lose sleep coping with a sick, cranky, teething, or hungry baby when he could just lie there and let the wife deal with it because, hey, she has the boobs!
So give him time. And if the time comes where you're getting pressure from him to start weaning, I recommend the following resources:
When to Wean
Extend Breastfeeding's Benefits
The American Academy of Pediatrics policy statement on Breastfeeding and the Use of Human Milk
Unraveling Breast Milk
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"