It must be difficult to deal with.
Negative atattitudes are quiet hard to manage.
You can't built a strong team.
Unless, you stay strong and positive.
Then:
*Set them aside on your inspiration list.
*Find a few who believes in you/build a strong team.
*Each steps of your success show it to those who are negative.
*And their change from negative to positive will follow while you are busy achieving you goals.