Even Parisians find their waiters abrupt. There have attempts over the years to make them less so, but they seem to take pride in it. But Parisians themselves are a friendly, helpful bunch. You have to remember that we appear rude to French people because our cultures are different. We do not address strangers such as shop assistants, as "sir" or "madam", we don't say "Good morning ladies and gentlemen" (abbreviated to "Messieurs, dames") , addressed to everyone in the shop, customers included, when we buy a paper, and so on. Given that, we are able to put their backs up without meaning to and it is not altogether surprising if we get an abrupt, unfriendly response.