I do not know you and I do not know Alicorn. I do not know who I would have the most sympathy for if I did know both of you. I find this whole discussion off topic. Alicorn gave some advice and I find the advice interesting whether she follows it or not, whether she even believes it or not.

It is very good advice (if and only if you may want from time to time to like someone that you have come to dislike). I personally have tried to develop ways to not start to dislike people in the first place and not worry about whether liking them is to my advantage. However, it has not always been the case that I could like someone and it was sometimes to my disadvantage - so I appreciate the advice.

I suggest that you judge the advice and not the person who gave it. The 'others of us' are not interested in this fight.

One possible reason Alicorn hasn't applied her technique to you is that it simply isn't powerful enough to overcome your unpleasantness. FWIW, I perceive you as a lot less civil than the LW norm, you seem possessed of a snarky combativeness. You also appear to have a tendency of fixating on personal annoyances and justifying your focus with concerns and observations that pop out of nowhere, context-wise.

In this case, your supposed insight into what would really be best for Alicorn plays that role. And then, having established this "lemma", you carry through to the conclusion that... Alicorn's behavior is inconsistent. Take a step back, and look at what you're saying. You're basically claiming to have reverse-engineered someone else's utility function, as the premise of an argument which concludes that they're being a hypocrite.

I hope you'll come to see this sort of behavior as embarrassing.

So why is Alicorn's advice particularly insightful on this subject?

Again, because she's not giving advice on knowing when you ought to like someone. She's giving advice on what to do after you have decided that you ought to like someone, even though you don't like them automatically.