Not that I disagree with your overall point, but while I might be being overly sensitive here, I think it's implicit that 9 times out of 10, when someone refers to "half the country", what they mean to say is "the half of the country not affiliated with the political party to which I am affiliated."
Yes, there are selfish people, but largely, that selfishness is not evenly divisible by party line, and the castigation of "the others" should be minimized, in my opinion, as most Americans, left, right, or center, are honestly trying to do what they feel is right.
As it sits, Republicans are statistically quite charitable[1][2], to the point that 9 of the 10 most charitable states are red states.
Yes, perhaps they see a different role for government than you do, and yes, I think that the parent to your comment was indeed acting selfishly, but that doesn't necessarily conflate to partisan beliefs, nor should we attempt to correlate individual behavior to partisan causation.
[1] - https://www.huffingtonpost.com/2013/08/19/giving-back-_n_378...
[2] - https://www.nationalreview.com/the-home-front/which-politica...