Ex - I am not a Roman Catholic. I have a PhD in Reformation studies and have debated RCs on the issue of transubstantiation on these threads frequently. Having said that, I still believe your pictoral post was puerile and in bad taste, likewise the stereotypical comment regarding child molesting.
Taste is, well, a matter of taste, and humor is often the best way of making a point. Naturally some people will appreciate that humor less than others.
As for your second remark, let me point out that stereotypes are quite often simply exaggerated manifestations of a fundamental truth. If the shoes of the fisherman fit...