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human
ELI5: Why don't soda crackers absorb mineral oil and why should I care?

My mom hosted a skin care and make up party last weekend. I came by after the party and saw a couple of Saltines (soda crackers) floating in liquid. I asked her about them and she said it was demonstration that the product rep had done.

Apparently, if you put a Saltine in a bowl of water it become soggy very quickly. If you put a saltine in baby oil (mineral oil) even after a few hours (she claimed forever) the Saltine does not get soggy. I thought that was pretty interesting and I was wondering why that it.

But it also brings up the second part of the question. The point of the demo was that this company didn't use mineral oil in their products. Because if it doesn't make a Saltine craker soggy, it's not good for you skin? I wasn't there to ask the rep why that made mineral oil bad but I was wondering if someone could fill me in on that. Thanks.
gpt
first of all, that demonstration sounds like its designed to deceive people into somehow thinking that what a cracker absorbs or does not absorb has any bearing on how healthy it is for human skin. Second, oils are non-polar molecules, water is a polar molecule, and food is organic (life loves water) The cracker absorbs water because of chemistry, nothing else. The cracker absorbs water because organic material and water have a lot of chemicals that play nice together, organic material does not contain a lot of non-polar molecules and reacts with oils to a much lesser extent.