husband doesn't like my hair

So I've been wanting to dye my hair for a while now! And I finally got it done today, and my husband hates it and we actually just got into an argument over it!! He said I could dye it if I really wanted to, so I set up an appointment, and when I come home he's mad:/ it's really upsetting because i haven't pampered myself since like way before I got pregnant with my son (he's now 5 weeks) and I finally got the chance today, and he's mad :(