I feel like his definition of 'monster' is skewed, if you want to see an actual monster to be scared of look at a crowd of people and then try to guess if any of them are rapists, serial killers or kidnappers, any combo of the three or something else just as bad altogether.
Or even worse, DUTCH! Dun dun duuun!
At least he realised his mistake quickly, if she wanted to hurt him she would have done it already.