Is it really so bad that I don't want to reuse my son's car seat for my daughter? His was pretty…

Is it really so bad that I don't want to reuse my son's car seat for my daughter? His was pretty unisex, it is teal with owls(because I'm obsessed with them) and has some brown in it. This is going to be mine and my husbands last baby and I want to have pink things for her! Like a car seat and high chair. I'm just so frustrated because my grandma and my husband think I'm just "spending money" instead of using what we have. I'm reusing all the toys, we were given a crib by my friend, which I would've used my sons if she hadn't, I'm even keeping my blue diaper bag and using it on her instead of getting a unisex one to use for both babies. Its just frustrating.