That's a vacuous, popular slogan, and, as such, is no argument for or against anything.
"Thing" means inanimate? Obviously that is false, seeing as "thing" is a noun, whereas "inanimate" is an adjective, a noun-modifying word. But I can see why clowns such as heretics, anti-Trinitarian cultists, would feel an urge to demand that to be a person is to not be a thing, and that to be a thing is to not be a person. Do you prefer to let such errorists shape and control your use of language? (It's funny that, in my entering the text of this very comment into the computer screen, AI is being used to try to control my use of language by notifying me, with a squiggly, red underscore, that its programmers don't approve of my word, "errorists".)
And, at any rate, words don't mean things; rather, persons mean things by words they use (unless they are speaking meaninglessly (which, alas, is an all too common occurrence)).
By your phrase, "the original text," are you referring to the Greek autograph of Luke 1:35? See, I had said nothing about that. Rather, I was clearly speaking of the KJV rendering of Luke 1:35, in which the translators referred to a person—viz., to Jesus Christ, Himself—by the word, "thing."
So what? I've got news for you: "one" is also not in the original text, and neither is "child," seeing as the original text is Greek, and not English.
Also, the word, "thing," is no more necessarily bound to connote impersonality than is the word, "one."
So what? I don't know why anyone would claim that it is wrong to do so, and that it should not be done. I don't know why anyone would claim that to do so is to deny the personality of the Holy Spirit.
True: the Holy Spirit is obviously a person. But, the Holy Spirit is, indeed, a power. How could He not be a power? It would downright blasphemous to deny that the Holy Spirit is (a) power. For, nobody in his/her right mind would deny that the Holy Spirit is powerful, or that the Holy Spirit has power. But, to deny that the Holy Spirit is (a) power while yet affirming that He is powerful, and has power, is to blaspheme Him by affirming that He derives His power from outside Himself—from outside God. The Holy Spirit is powerful because He IS power.
But, again, pointing out the obvious truth that the Holy Spirit is a person has no relevance in attempting to back up the asinine, false claim that He (or any other person) should never be referred to by the noun, "thing," or by the pronoun, "it".
To have a name is to be a thing.
To be referred to is to be a thing.
To be referred to as "He" is to be a thing.
To be quenched is to be a thing.
To be grieved is to be a thing.
To be a person is to be a thing.
To be a place is to be a thing.
To be an idea is to be a thing.
To be is to be a thing.
But you are a thing, because you are a person. So why would you not like to be referred to as a thing?
And, by saying, "Just weird," what, really, are you doing, if not merely advertising something as inconsequential as your personal taste? Frankly, that you (and perhaps many, other, like-minded people) have become accustomed, reflexively, to refrain from certain usages does not entail that those usages are erroneous.