Firstly, she has no relation whatsoever with that family to go there uninvited (we are not sure if Ayaan invited her)
Secondly, she went there hiding in a burkhah and without informing anyone, especially Asad (even if Dilshaad/Najma said yes, she should inform Asad)
Thirdly, her sweets caused the bride to faint causing engagement to break. A big mess
Fourth, Razia has gone insane and gave baddua to dilshaad and accused her of the BM crap and also poisoning (as SBS shows).
I am sure, like always, no one will know that its Tanveer is the one who poisoned sweets đ„±
So, I feel that Asad getting angry at Zoe is very very valid from his POV. He might not doubt her that she poisoned or anything but he will be mad at her for chasing museebat yet again and creating such a big mess. Moreover, he loves his ammi so much that she getting blamed will not go well with him AT ALL.
Even if I wanted Asad to support Zoe, why will he!?
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