I'm a long term member of a volunteer organization. There's been a sudden change in dynamic between me and a couple women. They seem to be bossing me around. I heard that they self appointed themselves as leaders, though I'm not sure what that's supposed to mean. They seem to have a lot of strange explanations for their behavior, like since they've been coming frequently that makes them more of an authority.
Here is one example: one said it was break time. Just as I was sitting down and opening a drink, she tells me to move something heavy and was very nit picky about where it went. It came across more of a demand than an order.
Other times she has told me that I should have known that I should have known that she would do something and often answers something I say with "of course" or "it's obvious". She's actually a bit new herself and a lot had changed since COVID.
How should I respond to this? I think volunteer organizations shouldn't be hierarchical and one is someone else's assistant or anything like that.