Preface: I am not a lawyer.
Typically mesh goggles are prohibited in airsoft fields in Canada (because of aforementioned reasons mentioned above) but not so much in the US. There is an implied understanding and consent to the risks and injuries associated with said risks when participating in any sport. In your case specifically, you are liable if the pursuant party could prove on a balance of probabilities that you had intentionally or unintentionally intended malicious harm by using defective or brittle bb's.
There would then be a viable defense wherein the fault lies with the pursuant party for failing to equip suitable eye protection permitted by the field owner.
tl;dr don't wear mesh goggles if you value eyesight.