I've not seen South east Asians become the victims of racism.
To my knowledge It happens a bit to Africans, Arabs and "India area asians" But of these 3 it seems to me that these days "India area asians" are no longer persecuted as they are accepted as being british by most nationalistic people.
Mainly because our general stereotype of "India area asians" is of hard working businessmen/doctors e.t.c who are putting a lot into our society.
The stereotrypes for people of Arab and African area origins are not so established. I think people are still afraid of them a bit. Also a lot of crime is attributed to them by the media.