As far as making an absolute claim, colloquially, people say something is bad when they mean worse than the alternative. To make an extreme example, smoking is much worse for you than caffeine but they are similar in many aspects. I do not feel the need to say that smoking is relatively worse. I say "Smoking is bad".
The formula vs breast milk feels more comparable to something like still vs sparkling water. You need to get your fluids from one or the other. Sparkling is arguably marginally worse for your tooth enamel than still. Yet I don't hear people saying that sparkling water is "bad" for you.
Sparkling water has a significantly lower ph than still water.
> Formula is trying to replace something that evolution has come up with...
Sure but the vast majority of what people use and consume is a replacement for what "evolution has come up with". That doesn't inherently make it "bad".
This is not true at all. What are you talking about? In general most people eat regular foods that come from the ground not ultraprocessed foods.
I don't know why you are nitpicking so much about the smoking example. I said it was an extreme example of something that is relatively worse but some people are comfortable calling categorically bad.
> colloquially, people say something is bad when they mean worse than the alternative [as opposed to absolutely bad]
I don't think it does support that claim, for the reasons I've given.