I feel your pain... AND I think I've figured out the problems.
1. You back-read.
YES
2. You back-read everything (for like comprehension, or some shit).
I can't help it.
3. Profit.
£¢
4. You feel compelled to quote damn near everybody and/or make snarky/thoughtful/sincere comments.

5. You either have to remember/look up how to spell words that you haven't used in over a decade
only oshi so far (due to not being used to having intelligent discourse with other people).
everyday of my goddamned life
6. You have to find just "right" gif (or YT video) to express something- because sometimes words are not enough. FML
Gifs are more fun
7. You decide you have to make the gif because the one you're thinking of doesn't exist or it's too much work to track down.
(Which can take a considerable amount of time.)
Or, I have to stop to try and explain how to spend a long time making a gif. Then forget what I was doing 
8. You constantly "Right Click & Save" an image that someone has posted (specifically flaming1, but others).
Not many, actually. 11 so far in 28 days
9. You have to constantly open a new tab because someone creates a new thread, posts a new pic(s), or puts a link in their post.
What's another tab? I have 2 windows and numerous tabs open though
10. You have to determine which reaction to use for a multi-quote post that contains;
"My cat just died" and "UnderCarriage is a prick".
Do you use "

" which could mean I'm so happy your cat died OR a "

" meaning that you feel bad for the UnderPrivileged and think people are picking on him. Decisions, decisions.
Nope, I react fast
11. You come to the startling realization that these are some yap happy batstards and you shall never catch up to them OR they want you remain in the past (like EvilSurgeon does...)
By the time I catch up, everyone is interacting with each other! Also, I had been mixing old quotes with new quotes, just to speed things along
12. You waste your time typing up all this wank.
Formatting, spacing, typing, spell checking, Then I go back and edit when I notice mistakes