dont have internet-
“The Big One” had cut-and-pasted something I posted.
To answer your questions:
I don’t use the eiruv because the rabonim I rely upon say that it is problematic.
My friend’s Rabbi holds that the eruv is OK and can be relied upon.
I honestly didn’t know if in this case I should say that since he is somech on his rav it’s not at all a problem, or if since he would be carrying on my account (because of my invitation) I should ask him not to.
I therefore asked Rav Feivel Cohen what I should do.
If a friend is doing something that me/my family would not do because of chumra I probably wouldn’t say anything regardless of the situation.
If a friend is doing something clearly asur due to lack of knowledge (such as adjusting the heat of an electric oven on yom tov) I would speak up.
If a friend is doing something that me/my family would not do because because my rabonim say it shouldn’t be done, but his Rabbi says it’s OK I probably wouldn’t say anything normally, but would ask him not to do it on my account – the same way I wouldn’t ask him to take my garbage out on Shabbos.