The links supplied to you earlier will give you all the tech backup your mind should need.
Hitting or doubling soft 18 or splitting 9,9 is just about always going to bring ploppy heat and heat from dealers who do not know how to play the game. The basic idea of the ploppy is that 18 is a good hand but we know, on the average it is not and especially not against 9,10 or A. Doubling that soft 18 gets you more money on the table while you have the advantage. These players are in some way benifical to us. Without their poor play more casinos would introduce more bad rules if they had to live with their BS advantage of say .5%in a shoe game. These plays and others probably bring their real profit to perhaps much closer or above 2% and gives us the chance to play with an advantage. So you just have to take the dirty looks or comments when things go bad or sometimes you are left with no choice but to say something.
I made a post the other day on a different board discussing my splitting 9,9 against a dealer 6 and the nutso woman at third base with a soft 18. I split and it works well. I get an A on the first 9 and then a 2, double and a 10. The woman stays on her soft 18, dealer turns 16 and hits a 3, loosing to me but beating her. She goes nuts about what a horrible play splitting a perfectly good 18 is and of course, taking the dealers bust card. When she actually got out of her chair and came next to me to yell, I just was not going to sit there silent. Stood up (I am a head taller than her) and told her if she had doubled she would have hit 21 and would be very happy and quiet now, saw the pit boss coming and sat back down. He sorts out what happens and tells her, "maam, players can play their hands any way they want, blackjack is not a team game." A line I have used myself.
As a bonus, she storms over to the next table leaving me heads up with a count over +3.
These kind of things do not happen that often and I realize that when it happens between two guys there is a better chance that it could escalate to more than words but in order to make money in blackjack you really can not give away these basic plays in order to maintain friendship on the table.
As far as dealers are concerned, many do not know how to play. Others are political and will take the side of the majority or the biggest tippers. Smart ones laugh to themselves, tell stories in the break room but just deal the cards on the table.