This is interesting - I read that statement exactly like the person who made the post that you just responded to, and thought it to be the clearly obvious interpretation.

I would consider someone that has their rationality stripped (or "greatly hindered") to be irrational. I think "irrational" is a bit more passive than "crazy", but I would personally read those as mostly synonymous.

I wonder why we interpret the same sentence so differently - we may be reading between the lines in very different ways - like the "blue&black / gold&white" dress.