April in Paris, chestnuts in blossom, holiday tables under the trees.
E. Y. Harburg
Yes, you can certainly encounter rudeness and downright unfriendliness by Parisians but it has been our experience that generally people are kind, helpful and friendly. Upon first meeting, Parisians can appear to be less casual and reserved, however this does not translate to unfriendliness. Be aware that often what you put out is what you get back, so if Parisians are approached in the right way from the beginning, chances of a more pleasant interaction increase.