i don't criticize products/people in public. why?

1. nothing to gain
2. no skin in their game
3. idk for sure

people who shit on others' products are doing it out of their own insecurity.
so don't get mad at them. you can only pity them. 

how do i know? i used to be that person

I see no reason why you should shit on other peoples products, doesn’t seem fair
I can understand criticism but shitting?
Glad you have this view ace

With such loose vague terms and no examples
How can you determine which is shitting and which is critique?