Don't be hypocritical.
“The term *mother of God* isn’t in the Bible either, but Catholics insist on using it.”
Because it’s valid and true.
“Don’t be hypocritical.”
I don’t believe in sola scriptura so it is literally impossible for me to be hypocritical on this score. Only those who believe in sola scriptura could be hypocritical in this matter and they, of course, always are.
That's just it, RCs don't NEED to show where a term, word or doctrine is found in Scripture since their church can decide on its own what is the truth and they have authority over the Scriptures. It's sola Scripturalists that insist doctrines be based on Scriptural warrant - most of the early church fathers did as well, but they don't count either unless they have to be taken from a shelf and dusted off to prove some point RCs at the time declare is "tradition". Does the word "scam" seem appropriate?