Offended in Houston

[cessna152towser]

I wouldn't let it bother me. I'd just say nothing, act normally and treat her normally and above all continue to wear that kilt.
Cultural diversity is a thing we must all accept. At best the lady didn't know the name for a kilt so she called it a skirt; at worst she's lacking in social skills.
As she's an Indonesian living in America there is every likelihood she could have been bought as a bride by some ageing western gentleman - a practice which some people may consider abhorrent and akin to prostitution - but in an age of multicultural diversity it is accepted that poor families in Indonesia often sell their daughters into marriage but we wouldn't ask her if that was her own situation nor we wouldn't treat her any differently from a bride of western birth.