I do not subject myself to heretics, and I have never found a priest who is not a heretic.
Let me ask you something - do you believe that I should be less 'picky' about my clergy?
Do you think I have the right to question clergy on their beliefs, or that I do not have the right?
A simple yes or no will suffice, followed by an explanation of why or why not.
Pius XI (11) was subject publicly to Benedict XV, who was a public heretic. He never abjured. He was publicly schismatic.
Proof? ......none, hence calumny
That's really funny, I don't seem to recall having enough time to provide any proof during the period between your question and when you concluded that I had no proof. I know, I know you gave me a whole six keyboard strokes (seven if you count the space bar), but I am just not that quick.
What proof do you want? That Benedict XV was publicly heretical? That Pius XI recognized him as a valid Catholic pope? Both can be pretty easily shown.