Off topic, but necessary.
The immune system is pretty complex. As you know, it provides protection from infections and diseases by identifying strange substances as alien. Vaccination usually curbs the issues with foreign matter in the immune system.
Vinegar adds character to lots of recipes and sauces. Vinegar is like a revival in your mouth, but has the tendancy to cause abnormal effects in the gut.
What I'm trying to say is ... don't be vinegar when you return to a place that you're now unaccustomed to. Your predilection of the place is decades old and practice here has changed. The only vaccination for this mindset is for you to go back to where your comfortable, which is no longer within the immune system.