Adding to the post on some of the issues that can be frustrating to both locals and tourists in Portugal.
The large number of tourists, 30 million tourists in 2023, the local population is about 10 million.
While the tourists aren't all in Portugal at the same time it still creates not only lines at the tourist attractions but also everywhere else, restaurants, public transit, service offices, etc.
This creates a crowded feeling.
AirBnB, the renting of private accommodation to tourists is creating availability issues for the local population and raising rental/ purchase prices beyond what is normally affordable to the local population. The rise in the cost of living is a big issue.
This is perhaps at the top of the frustration list.
The large number of immigrants ( illegal) that are from a completely different background, refuse to adjust to local society/culture and put a strain in public resources. They are viewed as a possible security threat and also clashing with Portuguese culture.
This is also at the top of the frustration list.
But there's also positives.
In some areas, tourists will be meeting other tourists and immigrants working in hospitality industry, sometimes that can create communication issues but it's my experience that staff try their best to help tourists.
Portuguese students are required to learn a foreign language in high school, most choose English, that's the reason for the high English literacy compared with Spain, and Portuguese will gladly speak in English to help practice their language skills.
Portugal has a long history of tourism in the Algarve and Lisbon - Cascais área ( there's even a British school in Carcavelos since 1932 , Saint Julian's for the children of British parents).
Portugal and the Portuguese welcome the tourists that are a positive to the local economy (hotels, restaurants, shops, etc), respect the law and local population culture and traditions.
While nowhere is perfect if a traveler follows the basic rules of personal safety and respect for the host country they'll have a good journey in Portugal.
That is my personal experience of extensive travelling in Portugal.
Edit : it wouldn't surprise me if others areas ( Portugal/Italy,etc) copy the tourist protest seen in Barcelona.
Jpeeps
Basque country and Catalonia have their own languages and independent movements ( theirs leaders have been arrested and released, somewhat recently).
Barcelona is part of Catalonia and some for political/cultural motives assert their language not just for their own culture but also as a form of resistance/defiance of the Spanish central government.
Also I've received medical treatment in Portugal in both private ( geared towards English tourists) and public medical facilities and in both cases the doctors spoke English.
The only issues were the waiting times ( they were non emergencies) and payment ( I paid and then submitted the expenses to my medical insurance).