Saudi is the is the largest oil exporter in the world. That is all that need to be understood here.
Saudi us also the largest financial aid provider in the middle east. It donated billions if dollars to different countries and projects,
When you fire rockets and attack drones at them , you piss the whole global economy not to mention all those countries in the middle east the receive aid , Or in other worlds - all the whole Sunni world.
Now the whole Sunni world is already pissed at them for what they are doing in Syria.
What ever possessed the mullahs to fire rockets on the world largest oil exporter ?
And they expect no reaction ?
And it did not start today , they have been doing that for a few years , long before trump got elected. So they cant use the sanctions as an excuse.
And if and when negotiation between the US and Iran will start again , it would not be just about the nuclear deal.
Their method of using proxies to attack other countries would also be on the negotiation table.
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this picture is for demonstration propose only
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