You may want to read the history between 1959-1962.
There may be some valid points as you have mentioned here...Otherwise, what can be a reason to host million of Tibetian refugee in India, knowing well that it will not be considered as a friendly gesture for China...
But the bigger question is that, if also, we have not received or encouraged Tibet people to be hosted in India, can we be friends knowing well that China already occupied part of Jammu and Kashmir? ...Again, i am not trolling here..But based on historical context, i do not find any reason why can not cooexist with each other...India has always have painful history of Islamic invaders attacking our nation but we never have any conflict per say with China in north...Rather, there are lot of good things i read in our history book about China which is very different in modern times...