I can assure you that if you spend time correcting coworkers' typos, this WILL hold you back in life. It's actually impolite and somewhat akin to a "superiority complex".
I guess unless you work for a newspaper and strive to become Chief Editor.
edit - perhaps a better explanation -- you're not the first to correct typos and MEANINGLESS (in the grand scheme of things) typos and grammatical errors here at MSFN, the next time you see somebody doing that here at MSFN, ask yourself if you want to be lumped in with that person and have all the rest of MSFN stereotype you as "one of those people". Most of "those people" tend to always land on "ignore lists" because of the "superiority complex" that they unconsciously convey.
I do not direct that to you, of course. You asked me to explain and that's my explanation, typos are MEANINGLESS to me, whether I am reading them or whether I am typing them, simply MEANINGLESS, lol.