In our current world of business, sales is a 2-step process: people pay attention first, pay money second. You can't sell anything to someone who's not paying attention to you.
In the mental game, what you pay attention to pays you back as long as you keep making deposits.
So, when you have 10 people giving you positive energy and 1 loser being negative -- and you focus on the 1 loser -- what did you just do? You paid the negativity. It will, in turn, pay you back as promised.
Invest in your positive energy. It is a bank account with compounding interest, with the best return rates any financial analyst has ever seen.