For those unfamiliar with the term, a teal deer is when someone writes tl;dr in a thread, standing for "too long; didn't read." Urban Diction definition here.
Now I'm honestly asking, not trying to start a debate (although if I do, that's what the forums are for, no?): what's the point? What purpose does basically saying, "I know you have an opinion, and took the time to write it out, but I'm not going to read it, because it's too long for me. However, I am going to respond anyway, just to inform you exactly how boring I found it," serve? I just read it as rude. Especially when the person who originally posted was being perfectly reasonable, with the content and length. Is it just people being obnoxious? Or does it have some underlying, politer meaning beneath?