We are immigrants who didn’t grow up here, so we have no idea what’s normal and what’s not.

I’m not sure where you’re from or where you are, but considering how this is escalating, I don’t think it matters.

I would actually take this to the school administration - principal and counselor(s) - and not to the specific teacher. A second grade teacher may not have the experience necessary to handle it properly, but the administration would. And you don’t have to bring it as “I want you to do something about this.” Present it as “This is definitely something you should be aware of,” at least in your first conversation with them.