Why is it that many dogs, especially new dogs introduced into the home, actively avoid or are hostile to the man of the home but tend to accept the wife?
From insects, all the way up to humans, there is a general pattern that there are fewer males within social groups than females. Especially with mammals, females tend to gain social status upon sexual maturity, whereas males take longer to gain physical size and maturity, and must earn their acceptance and status within a group.
Thus, by default, males will tend to be excluded. The ratio of females to males in any social group will be in favor of the females.
Through domestication, dogs are less likely to show these tendencies to unknown males, whether other dogs or humans. With wild animals, such as wolves, strange males are vociferously repelled from joining the group (an established family).
So, what is the trick to get a dog to accept a male human in the family?
That is for another article.
Just know that there are some things that can be done, on the initial introduction as well as during the ongoing establishment of a stable family of dogs and people. You are dealing with nature, so you either flow with the rules of nature or you can make things worse.
Plan accordingly.