They may be really outgoing as well, which can add in all the problems from the point above.I find their intimidating aura shrinks when you just have more experience with them.Sure they may be a little rougher around the edges than average, but they're hardly going to beat you down just for talking to them or being in the same nightclub.Someone who's socially inexperienced may be a bit too afraid of the world and see anyone who comes across as the slightest big thuggy as being super dangerous.
Here are the big ones: When someone is intimidated by really outgoing people it's that they're worried about having to talk to them and feeling really overwhelmed and like they won't be able to keep up or know what to say.
They can be scary in their own right because you worry you'll do or say something stupid around them and they'll call you out on it.
This is sometimes more of a problem for people when they're still in high school, when all kinds of students are mixed together and they may run into characters like this.
Some people feel uncomfortable around their friends' or partner's parents.
Hopefully this answer isn't too unsatisfying, but I think in these cases the way to feel more comfortable around these people is to face your fear and just get more used to talking to them.
You get used to them, start to see them as normal people, and learn firsthand that they have flaws and quirks and insecurities like everyone else.