Don't start with that stuff if you don't want to pretend. Then don't.
I tell everyone straight up what I think. In this scenario, you're talking to a guy and he is talking about how he gets to know all these people, but a lot of them think he is weird but doesn't tell him. I imagine you are the type to swoon and be all "oh noo... you're not weird at all, you're amazing, blah blah blah" I have literally said "well yea, I'm not going to lie, you're kind of weird. You shouldn't take it bad though, most people are out there. But yea, you definitely are" He can act all shocked and offended, but in reality he kept talking to me, and now there is no pretense and no pretending.
I find quite a few guys egos to be grossly inflated anyways. So I have absolutely no problems deflating it for them. It also is a certain type of guy too. I've met a few of them, and they're kind of fascinating to watch in a twisted way. But I've also met way too many guys who are the opposite to say all guys are like this, and that it's impossible to relate.