baby clothes question

Na
When washing baby clothes, are people following all the directions like "wash in cold/warm water with like colors" or "hand wash", etc.? I know it's important to use baby detergent, but whenever I ask my family who have kids about the other directions, they always say "yea I followed each tag at first, but pretty soon you won't care and just throw everything in together. It doesn't matter." 
Just confused lol.. What do other people do?
 I just don't want to decide to throw everything together at the same time if it means I'll ruin her clothes before she even gets to wear them.