1 yr old only drinks juice

My bf & I have a 3month old & we’re friends with a couple who have a 1 yr old. We’re first time parents so sometimes when Idk stuff, I read & pass it on to my bf. He hates that, he usually just listens to whatever his mom or any other older person tells him🙄 but whatever so we were talking about when our daughter eventually will eat food, solids, juice etc. so he tells me that our friends son doesn’t like milk, he prefers juice so that’s what they give him when he turns down the bottle. Now, I’m not one to judge & I haven’t been a parent that long but that can’t possibly be healthy. I told this to my bf & he thinks I’m going based on something I read & im like no, it just doesn’t sound healthy but maybe I’m wrong. Is that normal?