I understand what you're saying, but I feel like he explained it pretty well and made a pretty sensible argument to support his fears. It wasn't delivered in an inflammatory way, it seemed very matter of fact and obviously rooted in his concerns for his children.
Asians are a fairly small group, but a highly successful one. So far, they've made huge economic strides, but they are now becoming more culturally influential and you're seeing more Asians entering politics. Right now, Asians are mostly ignored by politicians because they are concentrated in areas that are already politically decided like New York, New Jersey, Hawaii, and California.
But what happens when Asians become more prevalent in battleground states and their votes actually begin to decide elections? When that domestic influence is combined with the fear of foreign powers like China, will they become the new target?
I think it was fairly well expressed. I don't think he was going to controversy, I think it's a legitimate concern for him.