I emigrated in 1994 and had never heard of Invasion Day until about 9 years ago when I was helping a half Aboriginal mate move house. Him and his daughter were on a call and wished one another happy invasion day. I was taken aback to be honest.
I'd say you and I seem to have a similar outlook on the whole thing but hey, I'm not getting involved in that.
Hope you have a pleasant day. Cheers.