"Particular affinity" refers to a strong liking or connection towards something or someone specific. It signifies a deep attraction or affection for a certain thing or person. Full definition
Someone at Nintendo must have a particular affinity for it, because durian is far and away the most useful ingredient in «Breath of the Wild.» (businessinsider.com)
If that brand has a particular affinity for one end of the political spectrum, corporate activism might still be good business. (canadianbusiness.com)
When I brought up the question of Ayn Rand, Kalanick denied adamantly that he had any particular affinity for the books. (fastcompany.com)