It may be a fear that is not statistically supported, but claiming it is not "based on reality" is, well, not based in reality. This does happen:
https://www.npr.org/2018/11/13/667252788/police-fatally-shoo...
https://www.npr.org/2018/11/13/667252788/police-fatally-shoo...
Is assuming you're in a vacuum based on reality for someone on Earth who is experiencing symptoms of hypoxia like astronauts would?