I'm an inch soft, 6.5" hard. The one time I was laughed at was a great party situation where everyone was drunk and half naked anyway. I said, just give it a minute. Some girls got their tits out, and my cock got hard before their eyes. They were mesmerized as it got bigger and bigger...and bigger! No, it's not huge, but compared to what you'd expect...a teeny little thing becoming completely respectably large - they were thrilled.
Got a couple of good strokes out of it from them in appreciation, but nothing more at that point.