There are several things to unpack here, but I'm going to stick to one.
The primary difference, in practice, between something like Gay Pride and something like "Straight Pride", would be the power dynamic between the two.
Historically, and even to some extent currently, the people with more power have been those who would be in the latter parade.
"Punching up" is what it's called when you are challenging a group more powerful than you - "punching down" is more commonly referred to as "bullying".
Sure, it's not necessarily one dimensional, but it also doesn't just scale in terms of total magnitude summed across all dimensions (e.g. a bit of power in 50 axes is not comparable to the same quantity of power in one axis).
The reason to care about the dynamic of the past is that people are influenced by the past - in particular, people's actions in the present are often based on things that they did or that were done to them in the past.
Specifically, here, the reason to care about the past is that, even if/when we reached a point of equilibrium, where a subset of people were no longer in a minority of power, there would still likely be X Pride events for a while after, because the feeling of needing/wanting such things would not go away overnight.
Or even multidimensional. a "sum across all dimensions" doesn't make sense to me.
We are talking about something (power) that differs across contexts, locations, times etc.
Power is as complex as our (human) social organisation, an is not amenable to linear algebra.
> people are influenced by the past
Unless that is is a result of holding this belief; People are never influenced about the past, only by their subjective, current beliefs about the past. It would make more sense to consider what people believe now.
Marxist historical analysis has fallen out of favor for a good reason.
> would not go away overnight
Desire for power will never go away.
The "subset of people" is biased towards how you do your grouping; For example, that I, a white man, am naturally grouped with white slavers of the past, such that modern black Americans have something to resent me for.
Your narrative here relies on these kind of groupings in order to talk about "a point of equilibrium" and "no longer in a minority of power" - you need to identify a group as the same over a period of time in order to make these distinctions.
The primary difference, in practice, between something like Gay Pride and something like "Straight Pride", would be the power dynamic between the two.
Historically, and even to some extent currently, the people with more power have been those who would be in the latter parade.
"Punching up" is what it's called when you are challenging a group more powerful than you - "punching down" is more commonly referred to as "bullying".