Nobody said he shouldn't be happy. The point was that bragging about them in public (as opposed to around friends or family) is unbecoming.

Being on the list is not, itself, a real accomplishment.

Building the business that gets you on the list is an accomplishment. After that, getting picked just means you know the right people. It's a derivative accomplishment that, on its own, has zero meaning or value.

Be proud of the thing you built, not the social noise surrounding "cool kids" lists. Who gives a shit? Do something cool, and take pride in that.