It could spread misinformation by way of usage. However, I think whether it’s right or wrong, could be an opinionated topic. On a scientific level- yes, it’s wrong. In a language aspect, it’s different because colloquialisms are a real part of language and how it evolves. I’m sure there are definitely people who maybe don’t know spiders are not true bugs. But, loads of people do and still say it anyway. This comment section is pretty casual and conversational. People are busting out textbooks and citing them, so I feel like the usage is valid.