Imperialism is fine. And those who critique conquering and colonial outright are essentially criticizing the messenger and the Sahaba and those now in the graves who conquered half the known world.
When Muslims whine about Western imperialism they complain about the immorality of conquering and colonizing in principle. This is kufr.
The only thing wrong with western imperialism is that it's not islamic. If Europe became islamic and established an Islamic state it would be an obligation to support the colonization and conquest of any kafir nation by the west.
Honestly Muslims in the west sound like communists. We don't support nation states and freedom and self determination. We support Islam!