A good friend worked as a the transport manager for for a smallish ecological diary producer. When the original owners sold the business, the new owners (a financial consortium with some food experience) brought in a new executive team in, who had previously worked together to create direct to consumer food startup (something like hello fresh IIRC). Initially my friend was very excited because the owners looked like they wanted to really grow the business.

Unfortunately it became soon apparent that the execs mainly had "cocktail party ideas" about changes, "we created a new business in this area that didn't exist before, which is much harder than running an established business. therefore we know best. How hard can it be". So the production manager and my friend soon became the naysayers because they said when they thought things wouldn't work. Soon after they both were made redundant, but the business is now very close to going under.

All this story just to say, that this is not just at cocktail parties, but also in work situations people like to discard established knowledge because they think they know how to "disrupt" .