NO they werent suppose to be out there.
US and the IAM have a clear cut safety policy in effect for lightening.
Many years ago, we had a mechanic killed in MCO when the plane he was on the headset with during pushback got struck by lightening.
Such hostility Albert, safety comes first.
I had an experience when I was going to push back a 767 going from CLT-FRA, there was a yellow alert in the area for lightening, before pushback I went up to the cockpit to tell the Captain, no headset and I would be using hand signals. He then stated he wasnt going to allow a pushback then, I called my maintenance foreman out to the plane, and he backed me 100% then the Chief Pilot was called out, and he backed, union representation and a safety committee are just looking out for the safety of its members.
This is about JetBlue, there are many negotiations threads at the AA Forum for that discussion.