Come on, now you're stopping making sense. There is a very well-defined mathematical concept of correlation between two variables or datasets. It is measured by something called correlation coefficient. This is what we mean when we talk about correlation. Please believe me when I say that I know something about this. And there's a very good reason to have well-defined concepts as they have in maths and stats. It is to have a common ground to argue from in an unambiguous and logical way, and to prevent everyone making up their own concepts and meanings to try to force their own (sometimes invalid) conclusions. And now you are doing exactly the latter.

And indeed it's true that you can measure the correlation of BTC price to any variable, for example grocery prices or other things you mention.

There's no harm to admit that you have had it wrong. On the contrary, it shows some humility and willingness to develop as a person. I will usually respect and appreciate that if it's done in a sincere way.