I have a house in Spain and once we're out of lockdown here, I'm off back there. From my own experience, these people are idiots. There are two ways to stay in Spain for longer than 90 days if they wanted to, 1) Obtain "Residencia" 2) obtain one of the many Visas available. The only time visas are refused, is if the applicant doesn't fit the criteria required (i.e. has a criminal record).
Overall the Spanish are very welcoming to Brits, but unfortunately a lot of Brits out there tend to be "little Englanders abroad" self isolating in their own "communities" and treat the Spaniards with varying levels of contempt.
I have no sympathy for these cretins, Spain is well rid of them.