I had this problem with my ExH.
I have to say, I don't think he was a misogynist, but he was insecure, and he was brought up to see his principle value to be linked to earnings and professional success, so feeling less successful and contributing less in this way made him feel insignificant.
I think this is indeed a common problem in men, and I think it can take a long time to identify the problem, and it also relies on other factors. Of course there are some cave men misogynists who will show their colours early.
But more likely you will discover this slowly. For example, one poster has celebrated that their partner is not like this, while saying at the same time their DH is 11 years older, still earns more, but is proud of what she is/ might achieve. I'm sorry but in this situation you just don't know what will happen. My DH was supportive and championed me for 16 years, appearing every part a feminist and supportive, until he started feeling bad about various parts of his own life, and my earnings surpassed his to a significant degree that he could no longer ignore. (Indeed I would suggest that if this poster's DH has partnered with somebody 11 years his junior, he may well be the type of man who feels best when he is more experienced, and might well have a challenge when he is growing older, loosing his lustre and professional power, while his wife is flying higher and higher.... so beware!)
Everybody needs to feel good about themselves and earnings are pretty central to that, particularly for men. If everything else is going well in their lives, in terms of ego, then most could overlook earnings discrepancy. But potency/ power/ esteem are balanced across multiple realms. Deficiency in too many at once will upset the apple cart.