You won't, or if you do, those people will be warned and dealt with.
If that sort of thing happens, you can take it up with one of the moderators of that forum, if they haven't already taken care of it, (You can see who mods a particular forum by looking at the box on the far right), or, if you don't feel comfortable, send me a private message and I'll get in touch with them
We're a pretty welcoming community, so I doubt it'll happen, but like any website, there are occasionally trolls who sneak on, but you shouldn't let that discourage you!
Best of luck!
-Kat