CallMeAl My DH can be similar, in that he thinks he is the expert. Fortunately, we haven’t had an issue of him getting offended if I consult experts.
When I moved in with DH, he had green potatoes on the kitchen bench, in full light. I refused to eat the potatoes he cooked, because I said they were poisonous. He didn’t believe me that 1)green potatoes were poisonous, and 2) that they needed to be kept in the dark. If google had been around, I would have shown him.
When one DD was diagnosed with autism, (which for the few years prior DH was in denial), DH suddenly became THE expert in our DD - he hadn’t read a thing about autism.
When another DD was diagnosed with coeliac disease, DH was also THE expert, but again, he hadn’t read anything.