I doubt that anyone was offended. But you will find a very strong negative reaction to jokes in the comments. I think there is a (very wise) desire to avoid a reddit type culture that rewards extended jokes and similar things.

This may well be the community for you, but just be aware that a lot of people are justifiably frightened of what can happen to online communities.

I think a good rule of thumb would be 'would be a waste of someone's time to read this comment'. People value the possibility that we can learn valuable things on Hacker News, but that becomes impossible if you have to wade through layers and layers of pointless jokes.

Not intending to be unwelcoming, but I think it can be a surprise.