It's not constructive. You throw that term around too loose.
Legitimate criticism is one thing, and it has it's place. Some of that criticism is legitimate, but the constant barrage of hateful criticism spewed by a few is way over the top.
I remember back when Tony Romo was the target of the same type of hateful non-constructive criticism.
There were those who absolutely hated him because he wore his cap backwards and they harped on it for years.
They blamed a lost playoff game on Romo going to Cabo and they harped on it for years.
Every bad game or mistake Romo made, the hate was spewed over and over by his enemies.
So it's no surprise when Dak gets targeted for the same kind of treatment.