Reminds me of a story, I was living in the blocks where most of the Muslims used to live, long time ago, the shop at the ground floor was a halal butchery. As non-believers we used to go there for last minute meal (it was more expensive than the supermarket) usually ordering chicken or lamb. Once I woke up late and needed some meat for a barbecue in the country, I wanted to ask for pork chops. I 'd completely forgot that they wouldn't sell me some. Once in the shop I open my mouth to order and couldn't say a word my mouth was silent, my brain was stuck. I think I was struggling between what my brain was supposed to ask and what my brain knew it was impossible to ask. (One of my colleagues used to say that it was the power of God). So, after the boss started laughing at me - probably thinking I was nuts, staying in the queue open mouth- I went to the supermarket.
But I think all these "faux-pas" are harmless, as long as the people who cares are not deceived.