This whole bit of conservatives concerning trolling over litter after protests is just their way of saying "how dare you protest!" and trying to come up with excuses as to why the Right of Assembly is being abused, somehow.
Honestly, I doubt they really give a crap about the cities being littered upon (they've been cutting Federal and State budget aid to cities since the Reagan Administration). So since I've been seeing Tea Partiers wring their hands with concern about litter on city streets I take it as fake tears and excuse to try and play in imbalanced game of trash Olympics (the biggest such claim was that the Tea Party rallies of 2009 produced less trash than the Obama Inauguration, but this fell apart when it was shown the claims of 2 million Tea Partiers were just 70,000 protesters who were around for just 4 hours.)
So when someone wrings their hands about protest trash in the city, be they Trump Defender or merely an off-the-shelf Lib'rul Hater, I find my eyes rolling. Hence why I first though this thread was a parody. Its a game they've played before.
And the game is that they don't want you out there protesting.