Okay, I admit it, I hate when people give advice at the blackjack table. Most of the time. But most of the time when another player is giving advice to a less knowledgeable player it is usually done in a condescending or overly arrogant manner:
“You want to double down on that? Really? Well, you should not. Come on and just hit already.”
Now it could be that the aforementioned fiction less knowledgeable blackjack player is thinking to double down on a hand that he probably should not or that has better odds when refraining from doubling down and only hitting. But there is a heck of a lot nicer way to say it:
“You might not want to double down on that hand. I would not. The odds are better if you stick to hitting because that total on those two cards does not give you a good starting point for only receiving one more card. It is up to you, it is your hand, but I would not double down there.”
Sure, it takes longer to be polite and to actually explain why the less knowledgeable player why the blackjack play they are considering is not the best when it comes to odds or house edge; they might learn something about playing blackjack. But the result is that the player might actually take your advice as opposed to thinking you a rude pig.
Also rude people are thought to not actually know what they are talking about. Fewer people listen to a rude person as a result. That first player might have really been trying to help the less knowledgeable player make the right play and learn something about blackjack strategy, but being nasty does not get anyone anywhere. Especially at the blackjack table.