He is the larger than life guy that they think he is. And he knows it. He's the guy who's cut from something different. Miranda is a lot the same.
He may be larger than life but he doesn't have to be a dick about it. Not saying that yours is necessarily.
My Shepard knows he's the ****. But he doesn't want anyone's worship or awe. Especially not those who put their asses on the line next to his every day. They may not be his equals but he doesn't see it that way. They're a company of heroes in their own right, and what's more they're Shepard's company. In general he tries to make any friendly relax around him. But if you step on that ship and pull your weight then you're as much above the rest as he is above you. Take Grunt being detained in Citadel for example. My Shep covers for him without a second thought. Grunt is my own. We don't leave our own hanging, and certainly not for petty ****.
Otherwise I didn't feel Miranda or anyone else stood out negatively at the party. Then again, it isn't your normal party when you have ancient Protheans, krogan battlemasters, asari justicars, the Shadow Broker, an AI, genetically perfect humans and krogan and various makes and models of badass supersoldiers, all headed by the galatic badass. Frankly I'm more sorry for the likes of Traynor and Cortez. They're regular joes at a superhero party, without the benefit of years of already being on the team.