Perhaps it's a bit harsh. I wouldn't judge anyone for joking about the DENNIS system in private. Blogging is a public platform though, and someone who is a hiring manager sharing their DENNIS system on a public platform with an explanation of why it's a useful thing seems like exactly the type of thing that would put some people on edge.
This is the culture war I'm talking about, there are different camps, and while I understand why some people want to be in the camp where joking about things that upset "sensitive" people is just fun and games, I think there are also a lot of people who see it as inappropriate in a professional context, and those kinds of jokes can feel exclusionary to them.
I'm really not trying to say anyone is right or wrong here, just that my own preference is to work in environments where most people who would lean towards passing up an opportunity for a joke that might make some group of people uncomfortable. I really hope you can similarly understand that.
My point was that this is _not_ a professional context. It's a personal blog. This would be inappropriate if he were giving this talk at his job, but... he's not. So I'm not sure how you can make any assumptions about how he behaves in a professional setting.
This is the culture war I'm talking about, there are different camps, and while I understand why some people want to be in the camp where joking about things that upset "sensitive" people is just fun and games, I think there are also a lot of people who see it as inappropriate in a professional context, and those kinds of jokes can feel exclusionary to them.
I'm really not trying to say anyone is right or wrong here, just that my own preference is to work in environments where most people who would lean towards passing up an opportunity for a joke that might make some group of people uncomfortable. I really hope you can similarly understand that.