It is to some measure an existing problem (though there are a lot of ways to contribute which are nearly 1005 uncontroversial, especially in more minor spaces - Wikidata, Wikitravel, Wikisource, Wikiversity, etc.) but it's definitely not the problem that the comment author describes. He didn't try to clean up anything. He didn't meet any adversity in doing so. He didn't try to pick up the trash. He threw the trash there and complained why other people - which are volunteers - are so lazy as not to promptly clean it up.