This is pure discrimination. It is the same level as racism, which is totally not acceptable.
It is like saying, because you are Dorje Shugden practitioners, I don't care if you do your job well, I don't care if you follow the law, I don't care if you have contributed to the society, I don't care if you have help many charity organisation, as long as you are Dorje Shugden practitioners, I will not be associated with you.
Does this sound familiar? It sure does sound familiar because this is how they discriminate people of different skin colour not too long ago. At that time, it is considered "OK" and "acceptable" but eventually, when people are more educated and have respect for others, they realise we are all the same and we should not discriminate.
It is very interesting to know that many people in the west who are brought up in the democratic way, when they listen to HH Dalai Lama's words, they don't think for themselves, and just discriminate, even though they learnt that discrimination based on skin colour, gender, etc are wrong.