buyer gave me 4 stars because evri got the outside packaging dirty?

i’ve been selling for a while, and have never received anything less than a 5 star review (from a member, i’ve had to cancel a couple orders before). i package everything securely, and only use shipping bags, new or recycled ones. i got a review from a buyer, who said i’m a “grate” seller but only left 4 stars so naturally i was curious and wanted to find out if anything was wrong, to which she told me the outside packaging was dirty due to evris handling? i’m guessing the buyer is a child because i genuinely don’t believe that an adult can think this is a reasonable reason to give a 4 star review. to clarify, i don’t really mind getting a 4 star review as long as they say what went wrong so i can improve for the future/discuss any potential issues with the buyer. i just found this odd