thats something i see a lot in this fandom... ppl that dislike sociopathic tendencies as personality traits, or care about the character being friends with others.
with anime fans i see the exact opposite - characters with sociopathic tendencies are fascinating, and many of the top characters are anti-social and have very small group of friends/one person they care about/none at all.
Tirek & Sombra
Chrissy is right after them
Discord - not completely evil, but not that good either, even after being reformed
Starlight - she wasn't even evil
nightmaremoon - kind of hard to rank... below Tirek and Sombra, but higher than Starlight