What would you do if you tip a dealer and they don't say thank you or even acknowledge it?

It's not at all like giving a lottery ticket to a waitress as a tip. Because a blackjack bet has about a 50/50 chance of winning. And if it does win they get double the amount. All these people saying dealers want you to just tip them, not bet it....well they are crazy. First - most players don't tip at all so a player making a bet for the dealer is appreciated. Second, it's your choice to tip so do so however you like. Third, most dealers know in the long run they will lose half of those $10 bet/tips and win half and get $20. It's found money anyhow to them and it makes the play a little more fun. If it lost then she should have said "thanks for the try" at a bare minimum. With only one try and no acknowledgment I'd let it slide and wait a little bit and do it again for $5. If that went without a thank you then I'm done. A good dealer would not miss on saying thanks, but they do have a lot to handle so cutting a little slack on the first one is probably in order.