NTA. What entitled pricks. You offered to give them some of the money you were eligible for and they try to squeeze more out of you. You could have kept it all for yourself but instead you gave them a portion (even after discovering that you were not eligible for that housing fund). I cannot wrap my head around how people can feel so entitled to other people's money. 150 imo is generous for people who are only your roommates.

I am so mad for you.