There are many antonyms that can be used for the phrase "slap in the face." Some of these include: kind gesture, praise, respect, admiration, compliment, and love. Instead of treating someone with disrespect, one can show kindness and admiration towards them. Instead of criticizing their efforts, one can give compliments and praise their work. It's important to remember that treating someone with disrespect and belittlement can leave a lasting impact, while treating them with kindness and respect can build a long-lasting positive relationship. In conclusion, using these antonyms can help eliminate negativity and create a more positive environment.