That is unacceptable behavior, and I am quite sure many neurotypicals would also agree, even though it definitely depends on the cultural context as well. At least here it is just extremely rude to bring more quests without asking the host first, or at least telling them beforehand, unless you specifically have that type of relationship, or the invite was clearly open. That is like intentionally trying to embarass you in front of their other friends, as you might not have enough food, or drink, or other things prepared. That person would not be my friend afterwards.