Tbh, I don't care one iota what people eat or drink. I have had people in a social setting in a beer place who wanted hot water. I got her hot water, making sure if was boiled and not just hot tap water.

Relax, order what you like and want. I also think you put way to much into the reactions. And even if they did, what does it matter? Besides hot chocolate in October is a perfectly normal drink. (Not that you should care)