I think the "difficulty" (for want of a better term) with the NAMALT discussion is that for some people it's a long established trope/debate particularly of you've been involved in online discussions around the area of male violence and for others it's only come in to their sphere recently due to it becoming the focus of traditional media discussions.
So for many, rightly, someone trotting out NAMALT is an immediate red flag of the kind of person who will deliberately insert themselves on twitter threads to belittle and deny women's experience etc.
So you can quite often have people who are well versed and have had to put up with this shit their whole lives and the language that's been co-opted by the equally well versed assholes is also the natural jumping off point for people who are only entering the discussion and haven't explored it in any meaningful way yet. "I'm not racist/not all men"
Now there's also an argument that it's still a bit alarming that someone has happily floated through life not engaging with a difficult subject just because it hasn't affected them directly, but I think that's different to bring willfully obstructive to the conversation.
I know when I first encountered it on here about ten years or more ago on here my instinctive reaction was "I'm not like that" but I think the key is a willingness to engage with a subject rather than the initial instinctive reaction. I read the discussions and experiences of other posters and the explanations of how what might look like an objectively true statement "not all men are like that" was derailing, shifted the focus, took away from the point of the discussion on males as a class and the violence they perpetrate as a class rather than it being an attack on me individually and also how it could be deployed by those acting in bad faith.
I don't think it's fair to say that one instance where someone starts off on the wrong foot because of a surface level reaction, listens and actively engages in the conversation can be classed as part of the problem as it appears is the case with the DH here.
I think it's similar to when you learn the origins of etymology of a certain word or term and are told of why it has offensive or racist or homophobic connotations. (Angry black man tropes/that's bent/some of the tropes around the williams sisters/throwing a paddy)
Decent people are willing to listen and try to understand why something that was an unconscious part of their vocabulary or traditions are actually adding to the marginalisation of others.
Assholes dig in and just exclaim "nah this has all gone too far, I've always called it the paki shop it's just descriptive, I don't get offended when people shorten british to brits"