You won't OD from sulfates in shampoo, but there are serious pros and cons to using them at all:

Sulfate-containing shampoos give you a deeper clean, but can dry out your scalp and make the color in color-treated hair fade. They're ideal for most people, especially if you don't wash your hair every day.

Sulfate-free shampoos are more gentle, but if you're supremely oily and/or don't wash your hair every day, you might not feel like they clean your hair well enough. Almost all "color-safe" shampoos are sulfate-free. They're ideal if you wash your hair daily and/or have a dry scalp... and they're a must if you dye your hair and want to keep the color looking nice!