They're just jealous. It's not worth getting worked up over. What you do with your money (or other people do with theirs i.e. gifting you them) is up to you.
I've two myself. A 3DS XL and a New 3DS XL. And sold off two standard 3DS models.
I've two myself. A 3DS XL and a New 3DS XL. And sold off two standard 3DS models.