Of course he is ignored. Why in the world would anyone pay more attention to him than some guy holding up a sign at a freeway exit asking for money? Both are just people who have done nothing special. Perhaps if he discovered a cure for cancer, the common cold, perpetual motion, or free energy someone might care more about his opinion. As it is, he is just some guy that gets paid to play a game for a living...big deal.
He can go protest with the dozens of other sports figures who bitch about how angry they are that the world is unfair, while they accept the millions of dollars per year they earn.