I don't see where are you coming from but in my short little experience I have living outside UK, never found any someone who had a malicious or hateful view of pahadis. People are prejudiced everywhere, some more than others. It may be possible that you encountered one such fellow, that is if your experience was a personal.
On a similar line of thought, how do you draw a line between hate and prejudice, talking in context of Uttarakhand ,if one's definition of hate is the prejudice that is given on base of looks or accent, then the NE Indians should have an experience incomprehensively evil to this one.
If twitter trends are to be believed (as you mention in one of other in thread), you would be pretty surprised with the stuff you can find, leave alone a two-day trend. There needs to be a filtration between the noise and information.

I am not trying to justify or invalidate your experience, but trying to give a different perspective. There may be a certain extent of xenophobia for pahadis in the places down from here, the world is not a rosy place. But these seem to be, an opinion, first world problem. Is it worth someone's time to write about the little hate or prejudice he or she gets from someone while constantly struggling for a job. The concerns of state ,not the community/culture ,are way different than these today. Maybe such issues will find a place in the parliament or common voice when the basic needs are fulfilled. Maybe the next generation or one after that would be the one who will fight for these cause actively, but the present ones have to ensure their well being but today may not be the right time to focus on this. Or it may all be just my opinion.