I wanted to write a blog post about this because I recognise that praise is one of the main methods used to reward behaviour.
Not everyone likes praise:
For praise to function as a positive reinforcer, and that is, to increase the future liklihood of the behaviour praised occurring again, it has to function as a positive reinforcer for the person being praised.
For some individuals, praise may be aversive; it may be linked to aversive events as opposed to positive events.
To condition praise, it needs to be paired with reinforcers. This is why individual preferences are paramount in ABA and PBS: to ensure the effectiveness of strategies.