I cant believe anyone on this site thinks it's acceptable to use the word spa, thinking that it's just a harmless word!
I think that people who use this word have forgotten, or are unaware that it comes from spastic. How can it not be offensive to call someone a spa, when in effect what you are saying, is that someone is like a spastic. How do you think any spastic people would feel on hearing this?
To me using the word spa is equally as bad a calling someone a mongol, schizo, moron, psycho etc. Thay are all belittling serious illnesses/conditions.
I think the reasoning has been covered, but you left out, loon, mentalist and nutter and i would think spastic people would be utterly dismayed at our callousness