the reasons people say things are probably varied. only God knows their heart maybe and possibly themselves... if they are aware enough.... yet.
but it also sounds untruthful, yes? so, it could be pointed out and questioned if one feels one should or if it goes against what you feel the Spirit is telling you strongly about what something means. though some are on milk and know not of meat, some on herbs and milk and wonder if there is more, some on meat and soon to learn about strong meat, some on strong meat and yet those on milk being of elementary mindset may truthfully say, "the Bible says" and mean honestly and unquestioning -- because it is what they see, you see, when they read the words... it is all that they can see... at this present time.
with God's help and if they listen, ever, for the Spirit to speak through the words and verses of the Bible more and become like a child as well, if they are not already -- open-minded, humble, meek, wondering, able to learn new things, more things, level upon level, here a little, there a little -- growing in more wisdom, seeking more truth, questioning what they once thought and claimed to others -- as truth, drawing closer to God and Truth -- God is Light, and there is no Darkness in Him. and so, the further we are from Him in truth, actual truth(s) and in spirit and obedience to our consciences with help of the Spirit; the further we are, then the more darkness (of mind) we would dwell in and think in [
1 Cor 13:12] - and the more difficult you may find to reach out to a person -- through your words to let them know that what they say seems to go against Spirit to you, or against whatever it is you believe at this present time from the whole of the Bible and the way you have come to look at it -- however it all happened for you. but because many teachings/views can, it seems be gleaned and fathomed from the reading of the Bible and throughout time by many different Christians in/from many different groups, they too might be quite like you in their methods of learning.... or not.
some questions to ask (to ourselves at least -- to gain better understanding of) -- are maybe.... how did they come to believe what they believe -- at present and what level are they currently at (milk, herbs, meat... )? will their beliefs (at present) hinder them and/or others from making more spiritual progress to other levels of of understanding, and do we know about the levels ourselves, and/or do we know how that all works? do we know what's best for them in their spiritual walk/education -- right now, and are they lost in somewhat slumbers of dogmas or doctrines which are preventing them very much from learning more/and becoming closer to God/His truth -- level upon level, here a little there a little? should you try to awaken them out of their current slumber and/or level, and how do you best do that and how would God/the Spirit want you to also and/or does God want us to.... or not?