I read a couple of answers here, but I thought I’d give my 2 cents anyway. I mostly agree with the others that said it’s not a big deal and seems to be a principle of hers.
I saw that you’re not from the US. In Germany, there’s an unwritten rule that you never bring any kind of food or beverage to a restaurant. We have other fun stuff like most restaurants not giving out free water or charging you for using the toilet if you haven’t bought anything.
I could see her being upset with you if you drank your own water and ate your own food in the restaurant. But, again, that’s only from my German point of view.
I have an LG 55C8 and was able to root it (somebody figured that out last year or so). I don’t know if you still can root your model, but I’d look into it! There’s a patched YouTube app which incorporates ad block and even sponsor block! It single handedly prevented me from buying an Android box and skipping the TV’s smart features altogether.