"He loves me... but is unwilling to believe that the parent training I invested in or my greater experience with the child have any worth, and takes my attempts at advising him from that knowledge base as a personal attack."
sigh
Other options:
no subject
"He loves me... but is unwilling to believe that the parent training I invested in or my greater experience with the child have any worth, and takes my attempts at advising him from that knowledge base as a personal attack."
sigh