You are not that important
With all the festivities going around, there are bound to be unhappy people. These unhappy people came from those who took offence on either how they were invited to the parties or how they were not invited at all! Taking offence is one thing, being dramatic about it is another.
There are just these people who need to be dramatic about their unhappiness and would go to any length to let known their anger. What made it worse is that they drag in "innocent" parties to the drama as well. They would go confront the host and ask why they were not invited... and why this or that person was invited instead! Aiyo...like drama minggu ini!
Although I have been in such situation and did feel a bit offended, I never made it into such a drama. Just accept it la... "YOU ARE NOT THAT IMPORTANT!!!"