i like jew ears
If you're going to say something like this, I highly recommend clarifying what on Earth it is you're talking about. I know I hadn't heard of those before seeing this post, and I almost reported it because I had no idea that you were referring to an actual kind of mushroom.
It's something tastes very similar with what I said a kind of fungus "the silver wood's ears" 銀耳 or 白木耳 that can replace swift's nest. And we can it 黑木耳 "black wood's ears" in Chinese. Although they are not actually that alike in looks. The recipes related to them are different as well, even they share a similar name in Chinese.
That is what it means, but it exists to varying degrees. Also, different dairy products have different amounts of lactose, yogurt and cheese not having as much as milk.
For people like myself, we don't actually care about lactose, since it's not possible to detected it with eyes or tastes, rather we need to identified the actual products that may cause symptoms. And diary products are generally associated with it. Like people always say it's better safe than sorry, so I tend to avoid food associated with diary products if it's possible, hence may cause the wrong impression that we can't eat anything related to milk. (For things that are familiar I'll know how much I can take, but others it's everyone's guess). Trust me, the diarrhea it caused was never fun.