people in nepal who didn't speak nepali as primary language were barred from entering into nepal army.  I've seen many qualified people not allowed to join army because their last name was not typical nepali last name.  I even know one person who hailed from a big jamindaar family.  As a jamindaar, he had good familial relations with Thakuri and most of the thakuris were in army.  Even then, he was not recruited.  Eventually, he didn't take up any job in his life since his passion was not fulfilled.  Now that his son wanted to join police as Inspector, he was asked to pay 20 lakh as a "donation".

Frankly. whole tarai belongs to those people whose primary language was not Nepali.  It was not until Judda Sumsher decided to snatch the land of those powerful jamindaar and asked the himali/pahadi people to migrate to terai, a trend which King Madhendra upheld.  Had these two people acted otherwise, there would not be any trace of Nepali speaking people in Tarai.

So, yes, there has been a big discrimination in Nepal.  And that's the reason these non nepali speaking people are pissed.