Depends on your audience. Preaching the basic logic of imperialism is required inside of a lefty org and is fundamental to building anti-imperialist coalition that can have solidarity with the global working class. And without this understanding, your org will fail to acknowledge and work around a populace who will perceive anti-imperialism as being against their own material interest, just like they see climate justice as "unfair" and against their own interests.

There is a point where you must be direct rather than manipulating indirectly and we should be finding ways to move it earlier and earlier in a person's introduction to socialism. I've seen a lot of groups try the indirect, manipulative approach and fail because they just plain aren't good liars, and that's what you need to succeed at it.

The thing one needs to take care in doing is to communicate effectively. Leading with, "you are privileged" without clarification gives a false impression that having housing security, healthcare, decent time off, etc are all unreasonable spoils that aren't deserved, and leaves the conversation at that. That's just bad communication and you see advocates of climate justice fuck up a similar line all the time, falling for a discoursd on degrowth that casts it as a decreased quality of life for those in the core rather than a seizure of power and resources away from the polluting ruling class and the capitalist system itself. But if you pepper it into a larger context of anti-war, solidarity with immigrants, or a maoist line on internal colonization, with examples, it can work great.

This is also why we should prioritize building within marginalized communities and worker struggles.