The US and UK condemn oppositionists for supporting dictators, while being even bigger supporters of dictators.

It's wrong for the US and UK to support dictators. It's also wrong for others to support dictators, even dictators that the US and UK oppose. That much is straightforward.

Where it becomes complicated is when some country's politics is a rivalry between one evil and another. For example, Morsi in Egypt was in the process of trampling the rights of women, but the coup introduced an even more cruel regime. Saddam Hussein was a murderous dictator but respected Iraqis' rights better, on the whole, than happens now.