You come up with a new idea and there will be 10 others ready to oppose it!
I feel happy about people finding mistakes in the work I have done on my new idea. This gives me the opportunity to have a look at my work from different angles.
Someone throw negatives on my idea, I pick them up turn them into positives and add to my idea. So their motive behind throwing negatives is defeated and also now the idea has come up even better (without any loopholes).
So those throwing negatives on my ideas, beware. You might actually be making my idea even more strong ;)