I'm invisble, you can't touch me.
Being invisible just means I can't see you, not that I can't touch you. If you were ethereal, I couldn't touch you, but I could see you. Get your superpowers right.
He could mean two seperate things.
I have leparosy and I'm covered in feces. Touching is not advised.
I meant everything I said. I'm invisible, and you can't touch me. I wasn't describing being invisible, I was saying I was also untouchable.
Think of it as if I said "I'm invisible, and ethereal."