Seriously service is very much fine in Paris. Most people are very nice. It’s always Americans complaining about it. I witness it everyday. Most American tourist expects service to be nice for no reason, is unpleasant, goes to the wrong person and then is surprised people are rude.
Stop acting like you are owed something. It’s all going to get better.
Even provincial French people I know complain about Parisiens being rude and unhelpful. Personally I’ve never had an issue as an English person who learned metropolitan French at school. Montreal though… wow.
The popular and/or well situated places tend to not give a shit, because what will you do? You're just one of a thousand customers waiting to get there, so screw you.
More standard places however, tend to be like any other places I witnessed in Europe, i.e. filled with run-of-the-mill merchants happy to get business.
Which explain the difference of experience between Parisians and tourists: the latter are (rightfully) shocked by prices and service in the shitty tourist trap on rue de Rivoli or Montmartre, which absolutely does not reflect the experience of the former in the little Georgian restaurant or their favorite bistro three streets down their flat.
Stop acting like you are owed something. It’s all going to get better.