I've lived in Spain for 20 years.
Letizia is seen a bit stuck up I think.
Also, during the corruption investigations that ultimately brought down Rajoy, there was a businessman under investigation for spending 34,000€ in luxury shops and restaurants on a "black" credit card from one of the failing/corrupt banks. These were cards they could spend freely on but the money was not declared anywhere.
He was friends with Letizia and she sent him supportive text messages basically saying the investigations were a load of shit and that she supported him.
Which, for the millions of people living in poverty in Spain was kind of like a massive "fuck you, plebs".