Dunno how common this is but in my home state of Indiana the non-discrimination laws include specific exemptions for properties used as homes by the lessor. I imagine that would provide an out for people like Crissie if it ever came to a civil suit.
Wow, this takes me back. I took intro CS at IU in 1993. At that time they were still teaching Scheme, using George Springer's Scheme and the Art of Programming and something like The Little Schemer (but not that because I guess it didn't come out for another two years). Delightful language with a really clean library. I always found Common Lisp's naming conventions to be—dare I say it?—PHP-esque in their irregularity. Scheme, meanwhile, actually has naming conventions. :)