Flower pretty well says it all.
for whatever their reasons, there are people who will growl: "It isn't light enough in here"; after you've just
turned on 300watts of light, or scream "Why'd you throw that at me?" if you toss them a bar of gold. It seems
your friend has that negative slant on life, and there's no concievable way that s/he will be open to hearing
something negative about someplace s/he apparently so desperately wants to be.
If you really feel it's important to provide some light, perhaps simply leaving something you've printed out
someplace where s/he will "accidently" find it may do the job. Otherwise it would seem the best
course in order to maintain peace is just drop the subject.
Hope this helps.