I generally agree with this sentiment. 95% of the folks we interacted with were very kind and helpful. However, we did get to sample some good old fashion French arseholery.
First night in Paris, climbing the common staircase to our 5th floor walk up apartment, we were vigorously, rudely, and hilariously questioned by a little angry old french dude. In a Monty Python type French accent he demanded to know what we were doing in the building?, who us let in?, and insisted that we leave at once! I calmly told him that we rented an apartment on Airbnb and showed him the key to the unit. He flew into a rage and demanded to know the surname of the apartment owner. I told him I didn't know, because I rented it on airbnb. He then called me liar and physically blocked the stair case. Then he demanded to know how much I paid... at this point the novelty was wearing off and I told him I didn't remember and that he could just look it up himself. After 5 mins of back and forth he relented and went back in his apartment. When we checked out I let the owner know of the incident, and his response was, oh he knows it's for rent and I've spoken to him about it many many times.
Another time the wife and I were walking back from the Arc' Triumph and wanted some lunch... looked on google maps and found a nice looking café on the walk back. It was just after lunch and we walked up to the almost empty café and in french I said bonjour and asked for a table for two. In English, and dripping with sarcasm, the man asked if I had a reservation. This was a simple café, and not particularly expensive or fancy, just a plain ass café. I looked at all the empty tables both inside and out and said in English that I didn't. He said they were fully booked and good bye. Could be true, but not likely based on his attitude, smirk, and the metric buttload of empty tables.