No. That only says something about you, not “the culture”. It’s incredibly common to laugh at the absolute absurdity of a situation. It doesn’t mean that people are making light of it. It doesn’t mean that they don’t grok how serious it is. They just react differently to you.
I agree there is more to it than yes/no making a joke of an incident. I associate it with a macho culture in which people do not feel safe to speak up in case of unsafe circumstances. Same for IT security.
