No that is not true, have you seen him play Morde top before? Do you know if he is bad or good? Can you tell the future? Have you seen every possible match-up between Morde and other champions?
Just because you don't think Morde is a good champ doesn't mean he is bad, he is really good in certain match-ups. That guy picking Morde top might just carry the game, but you wouldn't know that because you just blindly kicked him. If he instalocks Morde top when your team has a lot of AP and you need AD or a Tank, then yes that is not communicating with the team, but if Morde works for your comp then he doesn't really need to explain his pick. Otherwise i could report every person who has never communicated their pick with me... i don't pretend to know if a person is good with a certain champion, i trust they know what they are doing and if they personally fail then that is on them.
All im saying is to not judge a book by its cover because you might be surprised, have some faith because not everyone is a troll, and stop being arrogant in automatically thinking your opinion is correct because you might learn something new.