Ever since my self-diagnosis, I feel a weird 'us vs. them' mentality referring to myself as neurodivergent vs. neurotypicals.

I don't feel this way at all and I would recommend discouraging it within yourself. Treating neurotypical people as a threatening hivemind will not help you cooperate with them in your day-to-day life, especially as they are the majority. Neurodivergent people are also not a hivemind and will have differing opinions. We are all individuals.