I think initial like/dislikes are highly based on what difficulty you're playing on, so i wonder if the people discussing these things are playing on different difficulties.
Personally, I mostly play(and lose) on deity, and there's some steep penalties to initial meetings. even if i'm not being a jerk towards them(avoiding forward settling and the like), i also have to be able to match their agenda(intentionally or unintentionally), and/or have a suitably extravagant gift to give them. Through these means, i can sometimes befriend a civ early, but it's not always easy or even doable.-- in addition to the starting meeting penalties, i'm usually behind on comparative agendas.
Often they also like they also really like denouncing me(presumably to give them an excuse to attack me, because their early military usually outpaces mine), which makes diplomacy harder
When I played on lower difficulty levels, it seemed like becoming friends with everyone was way easier.