Bilbo opened his door and was greeted with a big massive back, when the dwarf turned around impression wasn't any better. He looked genuinely scary, but Bilbo was a Hobbit and he was in his home so he wasn't keen on showing fear, he had his rights as owner of this home.
He acted quite rudely for a Hobbit and any other Hobbit would get a hint and left but this was a dwarf and soon he was sitting back in the corner feeling like a stranger in his own home. His politeness obligated him to at least act as everything was in order, like his guest isn't being extremely rude.
The stranger ate all his dinner and asked for more. Bilbo endured all that quietly hoping that the stranger would get whatever he thought he'll get here and get out. If it would be any luck the meal will suffice. But there was another knock on the door and Bilbo froze surprised, could it be worse than it already is?
"That would be the door" said the stranger to him like Bilbo was the mad one here.
He went to the door ready to be more determined this time but was greeted with politeness that was hard to fight and soon enough there was another dwarf in his home. They greeted each other calling themselves brothers. And then there was banging of the heads that looked to Bilbo that could crack sculls.
They went into his pantry talking about his food like he wasn't even there. Then Bilbo tried to force them out, he said that they aren't welcomed. It was a hard task for Hobbit to do so he said it as politely as he could but all they gathered to hear is his apology in the end of his speech. So they accepted his apology without any effort to get out of his home. That's how third knock found him and enraged him.
He opened up the door and was determined to be as rude as possible and slam his door to the face of two young dwarves that stood in his door looking happy with themselves. Bilbo wasn't happy so he tried to slam a door to their face, but they just pushed them back open.
"Was it cancelled?" they asked with concern.
"Nothing was cancelled" answered Bilbo with confusion again defeated by his good breeding.
With that they entered putting on him their stuff like he was their servant.
"Be careful with that I just got them sharpened" said lighter dwarf.
He didn't get the chance to for another complaint when there was another knock. This time he didn't wait to open up the door to start ranting. He threw dwarf swords without any regard for whether they get scratched or not. He was determined to have no more dwarves in his home, there was too much of them in there already. He was ready for a fight, but he wasn't ready for the bunch that fell into his home. Behind them tall figure leaned in and Bilbo sighed with resignation.
"Gandalf" was all that was needed to say. Old wizard came with trouble like he said he would.
Of course they all came in and continued to behave badly ruining his home. He gave up in attempt to force them out and pretend that they never came, but he tried fiercely to save his home, preserve his things and stop them from wrecking everything. It was no surprise they continued not to pay any attention to him. He ended up yelling at Gandalf only to be meet with laughter and diminishing his troubles. Other hobbits would be appalled by his behaviour but these were dwarves to them his yelling was just amusing sight.
"You'll blunt the knives" he yelled in last futile attempt to make them behave but as reward he got a song in which his dishes flew through the air. He was horrified with the sight those dishes survived a hundred years of handling just to be thrown in the air by dwarves. At the same time a different part of his brain was surprised by a song that used his name like he was a familiar to them, like they knew him. Song was rough but it had its rhythm. Suddenly it stopped and Bilbo lost his words and anger in pure shock that all his dishes stood safe, whole and piled up on the table. In that state he heard last thump on the door, it sounded strong and threatening. He couldn't remember to get angry to another intrusion.
"He's here" said Gandalf like something new is at the door and all dwarves that laughed and mocked got silenced and still. Bilbo had no desire to go and open up his own door. Usually he was brave as the next hobbit but now he let Gandalf lead on like that were his door to open them up.