It does seem to be part of a process many men go through as they take an interest in feminism.
Starting out giving no thought to feminism, maybe even thinking it's just women moaning, there comes a recognition that maybe there is something to it. But having recognised that, they aren't yet ready to accept their behaviour is patriarchal - it's other men, bad men, not nice men like me.
Following on from that step, if they move on from that step, is finding out more about feminism and then, in their blokes way, demonstrating their manly superiority by mansplaining to all, showing they're an expert on the subject. Cos men have to demonstrate their superiority - it's part of male pride.
The next step, should they reach it, is a realisation that they have to self-reflect, to self-examine their own behaviours, to come to terms with the fact that they have and do engage in patriarchal behaviour. That they may have done horrible things. That yes, it is all men, even if they only do the more day to day things, like talking over women, giving more weight to men's opinions, staring at women.
Then they have to set about changing their behaviour, which is easier said than done, as it is internalised behaviour that is so ingrained it comes naturally without thought.
If there's further steps after that someone will have to tell me, as I'm still stuck there.
But, to be positive, men recognising patriarchy but not thinking its them is a step in the right direction, an acknowledgement that they've seen the problem, and they need encouraging along the path to where they can recognise it is them, what it is about them and that they have to change. But men come to this in their own time and it's frustrating having the same conversation over and over again as another man rocks up at step one on the path to becoming a better person.