Yes, yes I know already it's technically the correct term, no need to wank on about it.
But we also all know why "excluded" is all over mumsnet - over and over it's "excluded" this and "shunned" that.
FFS, not getting invited somewhere is not the eye watering drama you want desperately to believe it is.
Grow up. Get over it. And even if it is rude, or deliberate, stop saying "excluded", you sound like an attention seeking drama queen trying to give a nothingburger, an absolutely average life event, a whiff of formality and importance.