“China is willing to work with Spain to take Prime Minister Sanchez’s visit to China as an opportunity to further deepen strategic mutual trust, intensify exchanges and cooperation, strengthen multilateral coordination, and push bilateral relations to new heights,” said the spokesperson, Mao Ning.
I think it’s two things: 1) they have a set of relatively robust social programs that are extremely popular because they provide direct material benefits to people, and because of that firsthand exposure they’re opposed to others being deprived of it, and 2) they had a failed fascist dictatorship in close enough in recent history that they’re less likely to buy into those ideas.