No one is blaming the attendant. People are reacting (or not, as some claim) to their attitude.

The side issue of blame can be taken out with a different example: You stub your toe. A person sees. Suppose that they either wince in sympathy, or laugh derisively.

Do you feel the same about that person either way? For avoidance of doubt: Are there any situations in which your future behaviour towards them would depend on which of these 2 reactions they gave?