Letters are a powerful thing. Put them together correctly, and you get words. The key word being correctly. When you don't put letters together correctly it does not make up a word.
Listen, the fact of the matter is, people do judge you on your spelling. Whether it's a school paper, facebook post, or a tweet, people are looking at how you spell.
First impressions are the most important and if someone sees that you have misspelled a word, automatically their sense of you as a person has started off in the negative.
Spelling is something that is learned at a very early age, but it is your responsibility to keep up and learn the more complex words as you get older.
And in a day and age where there is spellcheck in almost every program or social network, there really is no excuse for not spelling correctly.
Respect the red squiggly! When you see the magical red squiggly under a word, know that there is a very strong possibility that you spelled the word incorrectly. It's not always true, but you need to check at the very least.
Here's a link to the 100 Most Misspelled Words. Learn them.
You ought to know: Spelling is an important life skill. Learn it. Embrace it. Use it.