They explicitly stated they knew where to read / hear about US politics and did not see the need to have that news domain echoed across every forum.
It would seem that in your view, we should be discussing all things at all times due to this "oppressor" mindset.
This simply cannot be true.
There are a great many such domains, and the insistence that everything is political is one of the chief problems with modern society. We can, and should, be able to enjoy some things together without bringing up bickering and strife. If you drag politics into a politics free zone you aren't taking responsibility for anything, you are just being a jerk.
If you disagree with that, be explicit about exactly what part.
Get it? Bad people in power = you don't get to do the things you love, at some point.
This prevents any reasonable discourse so is unlikely to be successful, no matter how dogmatically or assertively you present your case. Others will simply perceive it as unreasonable, I suspect.
This doesn't mean that you can't still believe it to be true - it just means that others will not engage with the points you mention, and you'll then end up being more isolated and frustrated.