Sloppy thinking is rarely completely irrelevant. If somebody says things about QM - a field in which I am competent to evaluate what he's saying - that are not only embarrassingly wrong but downright absurd, then I have to question either his honesty or his ability to judge his own competence. Which one is at fault matters less than nothing to me; either one makes me highly suspicious of him in fields where I can't judge his competence directly or haven't taken the time to read his opinions.