Grammar/spelling

Bit of a light hearted post, please don't take this too seriously; my spelling is atrocious at the best of times!

Does it bother you when people use the wrong word or make grammatical mistakes?

Such as: Were instead of we're,

There instead of their,

Putting me before I etc.

Or any spelling mistakes in general?

Which way would you say this sentence?

Who's that over there?

Whose that over there?

Who is that over there?

Which witch would you use when talking about the weather or whether you need to point over there or their?