I found a video about Leshan Giant Buddha and was watching it with my family. In that video some workers were cleaning the statue's head while walking on it (it is a giant statue) - and my family members were surprised that people walked on Buddha's head, because to them that looked disrespectful. I replied that it's not a real problem, because Buddha does not have attachment to respect and would not feel insulted. Was I wrong or is this correct? The Buddha would never cling to such concepts like respect and feel insulted, right?
We have giant Buddha statues in Sri Lanka too. But nobody walks on the head to clean them. There are respectful ways to do it if you are smart enough.
I have heard this ridiculous argument many times - "The Buddha wouldn't get upset. Therefore it is ok." The Buddha didn't get upset even when Devadata tried to drop a rock on him. The Buddha didn't get upset when Cinca Manavika falsely accused him of making her pregnant. That doesn't mean such actions are not wrong and not bad Karma.
The Buddha will never get upset whatever you do. That is not the point. The point is if your actions are disrespectful, it is bad Karma for you. It's important to keep in mind that being disrespectful does not require the other person to become upset.
The answer comes in the Akkosa Sutta below. Even if someone insults him or speaks to him in a hurtful manner, he doesn't accept it i.e. react to it. And so it goes back to the originator.
However in the case of the Giant Buddha Statue, perhaps they have no choice but to walk on its head in order to clean it. The Buddha statue is not the Buddha himself. It's only a symbolic representation.
I have heard that on one occasion the Blessed One was staying near Rajagaha in the Bamboo Grove, the Squirrels' Sanctuary. Then the brahman Akkosaka Bharadvaja heard that a brahman of the Bharadvaja clan had gone forth from the home life into homelessness in the presence of the Blessed One. Angered & displeased, he went to the Blessed One and, on arrival, insulted & cursed him with rude, harsh words.
When this was said, the Blessed One said to him: "What do you think, brahman: Do friends & colleagues, relatives & kinsmen come to you as guests?"
"Yes, Master Gotama, sometimes friends & colleagues, relatives & kinsmen come to me as guests."
"And what do you think: Do you serve them with staple & non-staple foods & delicacies?"
"Yes, sometimes I serve them with staple & non-staple foods & delicacies."
"And if they don't accept them, to whom do those foods belong?"
"If they don't accept them, Master Gotama, those foods are all mine."
"In the same way, brahman, that with which you have insulted me, who is not insulting; that with which you have taunted me, who is not taunting; that with which you have berated me, who is not berating: that I don't accept from you. It's all yours, brahman. It's all yours.
"Whoever returns insult to one who is insulting, returns taunts to one who is taunting, returns a berating to one who is berating, is said to be eating together, sharing company, with that person. But I am neither eating together nor sharing your company, brahman. It's all yours. It's all yours."