Oh no, I wasn’t trying to disprove your point at all! Just showing how extreme the situation needs to be to justify a suit. From what I remember most of the guests didn’t wear a suit either, but I can totally see it being a thing on the east coast.

Also Colorado. Granted, covid didn’t give me much opportunity here but I wore a suit this summer for the first time in about 5 years. It was a wedding and I was the officiant 🙃

Assuming not-Montana US, you can be fired for any reason other than membership in a protected class (race, religion, etc). Attending an ice cream social, even a company one, is not a protected class.