Not the parent, but do we have to start every sentence with "IMHO"? To me it was clear that they were stating their opinion, not trying to establish a standard for what one should care about.
It's less about it being an opinion and more about being respectful when sharing it. Obviously it's fine not to care about sports or reality shows (I don't either!), but he went out of his way to basically make fun of those who do. In fact, he didn't have to mention others at all! His entire comment could have been summed up as "I read news to make financial and political decisions." No need to brag about how much you don't care about celebrities or sports.
