I'd much rather be told I was doing something wrong than do something ineffective in ignorance.
Likewise. Indeed, having got into the swing of it again I might seek out some advice, e.g. on rowing technique.
And on other points above...
I do like that the gym I go to (cough) is quiet and has a no phones rule. The local football players train there too, which makes it their work, which I think helps too.
I am an MP3 player fiddler though. I start out with a spin on the bike and can untangle the headphones and choose a podcast in the first few minutes of loosening up. Works for me.
There was a woman in a hijab going for a walk on the treadmill yesterday. I can think of nicer ways of going for a walk, but I daresay copying me being sweaty on the rower doesn't float her boat either.