Thanks for the feedback everyone. I'm loving playing badminton again.
I noticed in some pro - matches people don't apologize on net shots - so I thought maybe it's considered a great shot as opposed to lucky as in Tennis or Table Tennis.
not all pro have good etiquette. in fact, some of them are outright poor at it.
but that doesn't mean it is ok. it only means they are setting bad examples for others to follow. we should always strive to have good etiquette.