"After twenty-four years of that kind of thing, you don't expect me to fall down and foam at the mouth when you hint that this sweet, clean, respectable, moral life isn't all it's cracked up to be, do you? I can't even talk about it, except to you, because anybody else would think I was yellow." (5.3.35)
Babbitt feels like Paul Riesling is the only friend he can truly talk to about his dissatisfaction with his boring life of business and family. Paul, though, isn't going to cheer him up just because he's a friend. If anything, Paul complains about his life even more than Babbitt does.