There seems to me to be no worse way to promote equality of treatment for a minority than to claim that any criticism of a member of said minority is driven by discrimination.
Lee Jasper’s claim that the media campaign against him is racist falls squarely into that category. Rather than admit that there are questions to be answered (even if he thinks he can answer them and clear his name), he tries to hide behind a claim of suffering racism, a claim which is patently absurd.
If there is any motivation to go after Mr Jasper in particular, its more a desire to go after Ken Livingston through him for political reasons. That and the newsworthy aspect of the case - allegations of corruption.
There are real cases of racism, sexism, homophobia and other superficial discrimination. It is quite right to campaign against them and to seek to educate people about them. Claiming discrimination in this way demeans the suffering of those who are exposed to real discrimination and abuse. It is crying wolf and will make people disbelieve true claims of abuse.

