I would probably say that is representative of how shallow he must've been as a person that even the closest people to him only knew him via the products he liked to use.

But also, it could be a product placement. If a military widow gets offered a bunch of money to say "He just loved the taste of Mountain Dew Baja Blast^TM^ and would love nothing more than to see as many Americans as possible enjoy that sweet, thirst quenching flavor." I say she should do it, it's funny as hell.