i don’t think it’s irrational no, there should definitely be an additional connection between you and his parents (compared to your friends and his parents) but at the same time i doubt he had any nefarious or negative intent by inviting them. if it truly makes you uncomfortable then i’d say they’re busy all together, or only invite two or three so they have someone familiar already to socialize with while not talking with you. you’re absolutely entitled to your own feelings in the situation.
the way i see it he might’ve just wanted to make sure you felt comfortable in the space. maybe he feels more comfortable when his people are present so he thought he’d do the same for you. not crazy to get upset by it though, you don’t have that connection w his friends or parents yet like #1 said, but i think he had good intentions