Well lot of topics here focuses on Rehat, but mostly on physical appearance. What my simple & ignorant brain understands is Code of conduct. Your actions & the way you live your life.
Most amritdhari think they should only associate or eat with fellow amritdhari. When Guru Gobind Singh jee said rehat payri mujko sikh payra nahi-means your code of conduct should be according to gurus teaching.
Getting admission in best school & abiding by the dress code can't make you pass exams, the only way to pass exams is to read & follows instructions
Any amaritdhari who follows guru teachings is respected by all.
Because dress code is easy to adopt & to follow gurus teaching is tougher therefore most people take the easy way out.
If union with God is possible through shabad than baani is more important. Anyone who thinks they are above all is far from God as God is in everyone of us.
One can see God all the time if one has those eyes. This body or vessel is Gods residence.
Please forgive me if my understanding not at par with most learned people here.