Well, in this thread, it isn't "people"....it was one person, and he followed the internet tradition of being unable to avoid making an English error himself while correcting someone else's.
If you still feel a need to chastise over it, have the balls to directly chastise the one offending party instead of giving a general broadbrushed indictment of all disguised as a blandishment.
Anyone wishing to avoid being looked down upon for their English composition skills would do well to take a lesson from the Hallmark Card folks who admonish us to, "Care enough to send the very best." It shows a disregard for one's audience to not at least make one's best effort. And there will always be people who will form opinions of posters who don't care enough to send their very best, lowering those opinions accordingly.