I went to an interview in the UK (fancy add/marketing agency) and they (the interviewer) had such a dirty messed up t shirt on, that I would not wear to dig the garden.
There is an asymmetry in the reaction though - being turned down by a company is regarded as just something that happens, turning down a company once you've had an offer seems to cause genuine shock.
Wouldn't that be more because people would expect the rejection to happen pre-offer if it's about anything other than compensation(turning down for compensation is normal, e specially with multiple offers)?