MGM - misdeal or dead hand?

[Jersey Nick]

4/8 limit hold ‘em
UTG folds, UTG+1 raises, MP appears as if he wants to call and says to the dealer “where are my cards?”
Dealer says “you mucked them”.
MP says, “No, I didn’t. That’s a misdeal”.
Dealer says “UTG+1 declared raise, you were next to act and your cards were over the line. I thought you folded and I mucked the cards. The hand is dead. Continue the hand”.
MP says “No, that’s a misdeal” and calls for the floor.
Floor comes over and says only one player had acted, there wasn’t significant action, and declared a misdeal.

I thought the floor was wrong as hell and I blame the player for not protecting his hand. I thought his hand was dead since it touched the muck. Thoughts?