My father immigrated here after WWII because he had married my mother in Orange, TX. He was surprised to learn that Lee's birthday was an Official State Holiday. All the banks and schools were closed and there were picnics and parades. Perhaps the turmoil of the Civil Rights Movement coerced local and state governments to skip it. The subject has been discussed here in the past.
General Lee's birthday is still a largely un-observed "state holiday" in all the former Confederate states. When WE celebrate it, then we should invite others. Personally, I choose to remind my family and friends of Robert E. Lee and invite them to celebrate with me.