A couple points - first off, there were hundreds of Patriot/Tea Party groups that applied, not just one monolithic Tea Party organization - each application was unique and individual.
I'm not sure how many of what you refer to as 'Occupy' applications were submitted, by your use I assume it was one.
The Occupy group that got a denial is actually years ahead (literally) of several dozen Patriot/Tea Party organizations that are still waiting YEARS LATER for a decision up or down on their application... So what? A group can not appeal a decision until it is rendered, by denying the Patriot/Tea Party groups a decision, they denied them the chance to appeal, and the appeal process would overturn baseless political denials. A delayed decision is effectively an unappealable denial - your 'Occupy' group, by getting a denial, could appeal - the Patriot/Tea Party groups can not.
Your lone counter-example proves/dis-proves nothing.
BTW, did your 'Occupy' group have their private donor information shared by IRS employees with other, non-governmental groups? Tea Party groups had their donor lists handed over by the IRS to Democrat groups...
You would benefit from an expansion of your news sources to include, maybe source documents and/or actual, under-oath testimony from the people involved...