Lulcielid is right.
Remember that real people will be reading these feedback surveys. If you write in a snarky, abusive, and mean spirited manner, and just come off as a total dipshit, they're gonna click X on your survey and stop reading it.
Put yourself in their shoes, if you read that shit for hours on end, you're gonna start feeling annoyed and won't be reading as carefully as you should.
That's why I mean it when you say if you want to ask someone for something, how you phrase it is paramount to them actually listening to you.
It's called etiquette and people skills.