The difference is in whether you believe, by your own heuristics, that your observations are a reasonable sample of whatever broader reality is in question. We all may say anything about our experiences and observations and be told, "No, you're in a bubble" - and we could be wrong, or that other person might be in a bubble!

Point is: Just say it. If you think the parent is in a bubble, just express the opinion. You don't even have to mount an argument or present evidence, but there's really no value in calling somebody's opinion "weird" just because, essentially, "anybody could be wrong".