Are people just using them interchangeably nowadays? I understand that language is what we make it to be, and I don’t think I’ve met a single person that uses lay correctly, so maybe it’s just time to define these as synonyms.
You lie down.
You lay something down.
If you lay down, that is in the past tense.
You lie low, not lay low.
You lie in bed, not lay in bed.
You can’t tell your dog to lay, that don’t make no sense. It’s not a chicken.