I think there's a difference between marketing a product to a demographic than believing that everyone born between 1982 and 2002 will all react the same way to a very specific action just because they are "privileged snowflakes".
Source: Marketing major. Marketing analytics professional. Millenial.
While yes there's nuance that's being missed, buying a particular product and consuming a particular medium is also a form of behavior, just as response to a particular event.
Source: Marketing major, MBA, over half a decade Marketing professional.
All jokes aside as I said nuance is being missed but also there's a difference in saying most of the people up in arms about this are likely to be a certain age and most people of a certain age are up in arms over it. Most people seem to be making the first argument which even if the age bracket is wrong is not that unreasonable.