There are also forums with thousands of members that will allow you to showcase your website in your sig or in a special section of the forum for sites, ads, etc. Each forum is different.
On a sidenote, there has been several hack jobs of this forum. It makes perfect sense to lots of people not to allow solicitation of members for other sites. Besides, would you want someone to join your forum only to post that they need members, and possibly never come back. Now that doesn't make sense.
However, regardless of the type of forum, I don't know of any (or don't frequent the kind) where someone acting uncivil is the norm. Forums are used for discussions whether people agree or disagree. Can't people disagree without calling another person a name? It kinda' kills a persons opinion when they loose control and do such things.
A Favorite Quote: To belittle, is to be little.