First, they are not trolling ''Iranians''. They are mocking the incompetent establishment of Iran. When you shout for 4 decades of wanting to ''razing Haifa and Telaviv'' to the ground and scream about destruction of Israel and Jews then people will expect you to do something about it then.
When did Pakistan or any other Muslim country talk almost everyday about destruction of Israel as much as IR? They are openly displaying their intentions of having no affinity with the Palestinian cause. Therefore you can not expect them to do something about it.