Had a lot of comments over the years from guys, mostly they were strangers. Although some occasions our conversation was an ice breaker that led to them becoming friends, so I guess that counts as comments from friends too.
A guy I become good friends with in college for example, the first day we met was actually taking a piss next to each other in the urinal. He's the kind of guy who just says whats on his mind so he couldnt help himself comment how big i was and his gf thought he was big. We got talking more and he mentioned how his gf was a bit of a size queen and I should meet her and her friends. This led to us all becoming a fairly close friends circle.
Another occasion from a guy who was already a friend and I didnt realise he'd obviously seen my junk in the urinal. When we were talking to a group of girls and our friends, we were just chatting general shit when conversation turned to some of the girls joking about guessing how hung guys were. My friend concerning me then said 'if he told you how big, you'd think he was talking in centimeters'
Most of the time though its just strangers passing comment in bar urinals or nude resorts, private parties etc. I dont really find it weird, doesn't bother me really. I guess some people can be more full on than others and you're thinking just chill a bit dude but I can just laugh it off.