I have worked in Vietnam for 13 years. During that time, I have been asked several times: "Is that Vietnamese national character?"
I don't think the people asking mean any harm. If anything, they mean well. I think it reflects an attitude of trying to understand and accept a different culture.
But when I hear those words, something bothers me a little.
For me, working closely with Vietnamese employees every day, that remark sounds like "stereotyping" or "giving up." As in, "It's national character, so I guess it can't be helped." It feels as if the thinking stops just before engaging with the person in front of you.