Did I accidently muck my hand?(ruling question)

[Stu Pidasso]

Three players including myself are in the hand. River card pairs the board but also makes my straight. I'm first to act and I bet out. I thought I heard the next person to act say "call" and I turn my attention to the last person to act(who folds). I turn my cards over and reveal my straight. Apparently my lone opponent had declared a raise and I misheard him. He claimed by revealing my hand without calling his raise meant I mucked. The floor ruled my hand was still in play because it was clear I was revealing my cards and did not intend to muck them(I turned them over in place and did not toss them into the muck).

Did the floor make the correct decision?

Stu