First and foremost, let's not conflate kicking and belittle. The former can be warranted, especially in harder content if said player isn't performing well. That being said, no one is denying the negatives. We simply disagree they would be any more prevalent than they are now. People willing to harass due to parses will still do so, they'll just avoid mentioning numbers. Anyone whining about parses in a dungeon are, bluntly stated, idiots. Ironically, this is now you exaggerating. Very few people even care about dungeon; many raiders avoid doing them entirely. In over two years, I have never once seen anyone mention parses in dungeons or normal modes. I won't argue it doesn't happen since I can only cite my own experiences but nowhere near to the extent you're insinuating.
Parses aren't a magical fix nor has anyone suggested otherwise. They'll simply be a helpful tool. I'm a far better player now than when I started people I looked up guides and parsed myself. Add a proper difficulty curve and we'll start to see improvements over the long term.