I Wonder Why Some People Are So Rude

I've noticed a trend on EP (and hopefully you don't all get bent out of shape). I think there's a large percentage of adults on here who just assume that all teenagers are stupid and have nothing of merit to say. That's fine, who am I to dictate what you should think? What really interests me is when an adult (who you would assume is mature) unnecessarily attacks a teenager on a post they made. This has actually happened to me a few times recently and I'm not really bothered by it but I do find it interesting (and quite honestly, fun). What what I've been told in the past week from adults on here is...
1. What I think doesn't matter because I'm only 14 (although he did flatter me and call me 15) :)
2. I'm the most annoying person another guy has ever met (although he actually never met me. It came about because I asked the question 'Who is the most annoying person you ever met and why?' and his answer was 'tou' *translation for those of you who can spell*...'you'). This led directly into my next point...
3. I'm stupid for caring about spelling and grammar. I guess I should start using txt spk! :)
4. Apparently, 117 lbs for a 14 year old is 'overweight' so I need to start dieting.
5. I am smug, a prick, have self esteem issues, a cretin, and 'little miss perfect.'
6. I have no business responding to rude comments on the posts I make...(that's what makes me a prick apparently).
So thank you adults for paving the way for us teenagers. The world is a brighter place with you in it.