What should you know about French dining etiquette if you're invited to someone’s home in France?

Why do some people get so upset when others let someone with fewer items go ahead in line? Have you ever dealt with a situation like that?
Why are maga Republicans so deep in the Trump cult that they literally defend everything he does including what he did in the Trump-Epstein files? How is that not a bridge too far for them?
Why do some people feel like they can only truly love after experiencing a relationship with a narcissist? What changes in them?