Yeah I get what they're talking about. Humans are pack creatures, we want to band together and cooperate, but we've also developed techniques for strengthening internal cohesion over time that are counter-productive to forming larger cohesive societies. One of those is hate and fear of out-group members. It's convenient for conserving resources if you feel justified in hoarding them for the ingroup. It's also a prejudice which is useful for producing precedent for stealing resources from weaker groups, thus preserving a surplus for the strongest collective.

Ultimately, this tendency in humans has existed prior to structured society and organized religion, and it takes a great amount of teaching and practice to restrain this urge. Ultimately religion mostly serves as a channel for this natural tendency of ours. However, the original scripture seems to directly function to reinforce this othering, which makes sense when religion is written by humans.