If I didn't know him though, and saw he had a camera in his glasses I probably would think pervert. Or at least hold it in my mind as a possibility to the extent I don't think Id employ them to clean my windows. I live in a ground floor flat anyway, so my bedroom and bathroom and living are all ground floor. Not that I would be walking around starkers when the window cleaners there. But I really would not like the thought of someone potentially filming into my house. Even my living room/kitchen TBH.
And the question then goes, if he isn't a pervert why did he want the glasses. It is at the very least voyeuristic even if there's no intention to see anyone naked etc
And for him, as for everyone, most people he meets don't know him and his family very well. So they will be making judgements accordingly.