The problem is that they need to directly als him, and don't forget Ezra didn't want any valueable stuff for his daughter's birthday before.
Grayson actually gave Ezra "a lot of money", he is just unaware about it. That gift for 49,99$, it's real worth is iirc spoiler .................................................................................................................................................................................................................................................................................................................................................................................
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~450.000$
Well yeah I figured this much, but my point was that he just lacks empathy (he's psychopath so I understand that it is a part of the reason) but since he do behave very selfishly most of the time - by choice, I just get why he got this response since I too would be pissed in their place after all he is a grown ass man not a toddler

I would be pissed too, because for him it's pennies and yet he didn't even though about helping out and insted got jealous about them hugging?? Bro wtf?