What are the psychological tactics narcissists use to create confusion and control in relationships or societies?

What are the psychological impacts of feeling isolated and constantly watched, and how can one seek help or support?
Is it rude to say “so sue me” and fake a frown when my bisexual ex friend tells me he felt like I was being dismissive when he told me his parents are homophobic and I said “not my problem. Leave me alone”?
Today I saw an attractive girl wearing a sports bra in public. I find this inappropriate. What should I do?