Every coin has two sides. It is simple that people has different opinion deed the different sides of a coin. Just because, we couldn't see the other side, Doesn't mean we are right and the other one is wrong. It is about the maturity of understanding their view from their point of view.
Importantly, it is not necessary to walk on the shoes of everyone to understand their views. From our past experience and our bonding to that person will make us realise the intention of that person's negativity.
Try to understand the person's view, only if he/dhe doesn't want you to get into trouble with your action. Just ignore the people who just peep into give an opinion in order to show off their knowledge.
There are certain jealous types talks negativity. Simply because of their inability to match your ability.
Some innocent types of people talks negativity, because of their limited knowledge , it is your choice to show some light or just ignore.
As the author mentioned. I see some people seeing negativity in everything and lamenting their own life, but later I understood, they just say to avoid the evil eye of others. That is, deep inside, they actually enjoy their life but they don't want others to know it and feel jealous on them. So, don't believe on everyone who says they see only downs in their life and pity for them.
All are blessed in one or the other way. If we could see the positives in one action and others see only negatives, it doesn't mean we face an obstacle, it is a positive side that we r confident enough to handle the negative sides of it confidence.