Criticizing the institutional Church and the hierarchy is not defaming it.  Defaming involves falsehood.  A church that fires gay people for being married or that expels children of gay couples from their schools is abusing them.  A church that will not ordain women, thereby excluding them from any decision-making positions is treating women as 2nd class citizens.  
Defaming also involves causing harm to an entity, or to its reputation.  I am far from being influential enough in any way to cause harm to the institutional Church or to its reputation.
If criticism of the institutional Church offends you, then this might not be the best site to visit.