"Your an idiot" is the worst.
When someone says that, it defeats the whole purpose of the point they're trying to make. And you just know that some 'tard will most likely reply to this thread with that exact line.
Spelling errors are fine... not everyone has perfect spelling, grammar, etc... but at least learn to fucking spell essential words/phrases if you're primary language is English.
And all the fuckers out there can quit checking MY posts for spelling errors.
Sponsor/Sponser is another one.