Never separate colors it’s a myth started by the big soap companies to get you to do more loads! LOL
My gym uniform from middle school diss agrees
School colors Red and White
red shorts white T with the school name printed on both
and yes they were rather short shorts and everyone had to wear them
in high school we could wear our own as long as it was Red , White or Black the school colors
so many people ended up with a pink shirt , and every one knew exactly what had happen the red shorts blead bad.