Specifically acquitted, no.

I couldn't find a case where someone was acquitted specifically because they fought an unidentified or plainclothes ICE agent. If that had happened, it'd probably be a pretty high-profile precedent.

What I did find were multiple cases where charges were dropped, people were released, or courts ruled against ICE after video evidence contradicted the agents' version of events or judges found the arrests or detention were unlawful.

So it's not true that the courts are just rubber-stamping everything ICE does. They're ruling against ICE all the time. The bigger issue is that many of those rulings are case-specific and don't automatically change ICE's practices nationwide.

Those are two very different questions.