Claustrophobia
Here’s another person who forgot that dictionaries exist. We’re happy to see that this person understands that the word “Claustrophobic” is an adjective, but they seem to apply a very limited definition to the word. They’re convinced that the OP does not know how to properly use this word and tried to call them out for it.
By their overconfident delivery, we are pretty sure being put back in their place was the last thing that they were expecting. Again, we don’t all know everything, and even things that you think you know …they can be incorrect.