[ghaff]

Look on this board. The person who corrects breaks to brakes, loose to lose, etc. is going to be viewed as at least mildly pedantic. Granted, people make mistakes typing they wouldn't make speaking but the principle is at least similar.

[irrational]

I’m one of those who feel the urge to correct to/too, their/there/they’re, etc. errors. But, I recognize that the main issue is I don’t know who is on the other side. Is it someone for whom English is a second language? Is it a native English speaker that doesn’t know or doesn’t care to know proper grammar? Is it someone who knows proper grammar but just made a simple mistake? Is it someone who welcomes correction?