Yeah, I think the suggestion might be a little territorial and hasty. Being invited to open meetings to gain better insight into alcoholism is a far cry from wanting to walk someone else's path. But...there is a line when it does become that - which is where Al-Anon can be helpful to disentangle one's self.
I think you're fine - doing the right thing by educating yourself to the resources out there. Al-Anon would welcome you anytime you felt you needed it.