Yes double standards exist. Some thinkers argue that they should exist and some don't. The argument is that a double standard existed against Blacks for so long a counteracting double standard is reasonable.

The only possible argument against the double standard is that it has gone on long enough and the field is now level enough for minorities to take responsibility for their quality of life. Bill Cosby is speaking out on that subject and some are listening

Regarding the personalities: Al Sharpton has moderated his views at least publicly and La Raza is hardly a mainstream voice of Latinos.

La Raza is a spooky guy in the same vein as Louis Farakan and the now dead G. L. Rockwell. Not mainstream by any means. There are plenty of examples of marginal players on both sides.