The point of A-theory is that past, present and future are non-relational. There is an objective fact of the matter about which slice of the space-time manifold is the present, although this fact keeps changing, of course. So yeah, one way to think of the difference between A-theory and B-theory is that the B-theorist thinks of past, present and future as relational terms. Just saying "past" isn't enough, you need to specify what it is in the past of. But the A-theorist thinks it makes sense to talk of past, present and future simpliciter.
An event (a point in spacetime) is really objective wrt time: that is, it is outside of time. The ordering of two events is also objective.
The matter of where we are in time - and therefore, whether an event is in our past or in our future - is constantly changing as time flows. It is not a time-objective fact about an event that it is in our future, for tomorrow it will be a fact about the same event that it is in our past. So these facts about an event are subjective: they depend on when in time you are when you are making the judgement.
Disagreeing with ...
Despite being (IMO) a philosophy blog, many Less Wrongers tend to disparage mainstream philosophy and emphasize the divergence between our beliefs and theirs. But, how different are we really? My intention with this post is to quantify this difference.
The questions I will post as comments to this article are from the 2009 PhilPapers Survey. If you answer "other" on any of the questions, then please reply to that comment in order to elaborate your answer. Later, I'll post another article comparing the answers I obtain from Less Wrongers with those given by the professional philosophers. This should give us some indication about the differences in belief between Less Wrong and mainstream philosophy.
Glossary
analytic-synthetic distinction, A-theory and B-theory, atheism, compatibilism, consequentialism, contextualism, correspondence theory of truth, deontology, egalitarianism, empiricism, Humeanism, libertarianism, mental content externalism, moral realism, moral motivation internalism and externalism, naturalism, nominalism, Newcomb's problem, physicalism, Platonism, rationalism, relativism, scientific realism, trolley problem, theism, virtue ethics
Note
Thanks pragmatist, for attaching short (mostly accurate) descriptions of the philosophical positions under the poll comments.
Post Script
The polls stopped rendering correctly after the migration to LW 2.0, but the raw data can be found in this repo.