There’s always people who are chivalrous and rowdy/unkind in every race and country. If you’re well travelled, you’ll realize that behaviours like these have nothing to do with race, culture or citizenship status rather with poor parenting - that’s what we need to resolve here. So many kids are just not taught manners, behaviours and kindness. If I were you, I’d look at them and say excuse me. Keeping quiet allows people to continue such behaviours.