Though I prefer to think that everyone wants to support the best of you, it is true that some do as they say aim to pop your balloon. They get in the way of you and the happiness or celebration you desire and/or deserve. Why does this happen?
Natural response
For some, meeting celebration and happiness with negativity is a habit. That's simply a natural response from people like that. Some people are negative.
Angry or disgruntled with you
Others may be angry or disgruntled with you for any number of reasons, and these feelings lead to their negativity with regard to any happiness you have.
Disagreement
Some may disagree with your values, pursuits, or ways of living your life, and this disagreement leads them to be negative about any happiness you have.
Desire to hurt you
Some, for all kinds of reasons, may want to hurt you to show their anger, frustration, envy, or disagreement with you.
When people aim to pop your balloon, what do you do?
First, consider their reaction and if you did anything to make that happen? If you feel your actions have precipitated this response, you may want to make some changes because who wants people treating them with negativity and ruining their happy moments.
Next, if you've assessed your role in the matter, made some change, and the negativity continues, you'll probably have to put some space between yourself and the negative individual. No one should be able to spoil your happy moments or chapters in life. We all have happy chapters and we all have not-so-happy chapters. We should be able to enjoy those bright moments in life.
And, be ready to welcome that individual back into your life in time. Often our own hurts, struggles, and worries can get in the way when it comes to celebrating another person's joy. We have all experienced and/or observed this. Our own hurts can be so great at times that it's almost impossible to celebrate someone else's joy--this happens, and we have to have empathy fo ourselves and others when this experience occurs.
So, don't let others pop your balloon, but also give those people space for the experiences they may face--we're all traveling different paths in life, and if we can be compassionate and loving towards one another and those paths, we will do well. Onward.