You're now denying factual on-screen proof.
"Lit up" does not equal damage. "A flickering display"does not equal damage.
"Literally showing damage in the armour's damage indicator" does equal damage.
These aren't ambiguous or arguable points - none of this is open to interpretation or the subject of debate because you can't see something else - they're explicit facts that prove the point emphatically.
That's quite explicitly the end of the debate. Iron Man has an indicator that shows when damage is occurring. On two occasions, it highlights areas in red, because damage has been done. It absolutely 100% does not show any damage during or after the lightning. That's the end of it. That is proof. If you're still attempting to deny something after the most emphatic visual proof has been given, claiming you can't see it, there's no point in debating, because you'd argue black was white.