Non-specific stuff: some feel he's weighed in far too often on the Colin Kaepernick stuff, has called him a "fraud", has also said that he would "never allow anyone to take a knee" when the anthem would play, etc. Some people believe that prioritizing the flag over the feelings of minority players is racist. Former players Ron Gant, Royce Clayton, Brian Jordan (among others) have called him a racist. Marcus Stroman obviously feels the same. I don't have specifics, just citing what's been said. Specifically: in 2010, La Russa publicly supported Arizona's odious SB 1070 law, which essentially encouraged racial profiling of Latinos. Ozzie Guillen spoke out against it.