Trams, Trolleys and Streetcars

Instead of "are you implying?"

You could just say "trams back then did have advertising on the side!"

Then you'd be educating without judgement.

Maybe he was implying that if this tram is only in use for historic relevance, then maybe it shouldn't be plastered with modern ads, as it somewhat pulls you out of that "historic wonder" mindset. Maybe it could have old historic ads as well.