OP I think it’s a particularly British perspective, probably because of the types of holidays that Brits will typically have in the respective countries. I’ve lived in France for 16 years and I don’t have any sense at all that the French think that Spain or Portugal are downmarket compared to France as a holiday destination. The Spanish package holiday really doesn’t exist in the same way for French people, and the majority of French people actually stay in France for their holidays.
so for a British person
Spain = resorts, beaches, cheap booze, British bars / menus, sunburn, sand, Club 18-30, cheap package tours, drunk teens staggering out of night clubs etc
France = good food, good wine, history, French spoken, camping, family holidays, etc.
there is no equivalent in France to the big tourist areas in Spain, which were developed in the 70s with British (and Dutch, German, Belgian) tourists in mind. Cap d’Agde is tiny by comparison, and only fairly recently developing as a British fun-in-the-sun destination (thanks to Ryanair).
But in reality actual Spanish and French people both tend to holiday in exactly the same way - camping, by a beach / lake / river, with family, focusing on food and sports and outdoor / water based Activities.