May be this will be taken as a provocative statement but it's 95% true and only 5% provocative:
Grammar or Spelling mistakes are indispensable to the evolution of any language.
Just as DNA replication errors are indispensable to species adaptability.
Arguably, the typo you mention in your example is not a mere simplification but a real spelling error which you could easily have caught during proofing. My answer takes a broader standpoint though.
Today there are in Modern English over one hundred irregular verbs. In Old English, there are hundreds of them. Why do we have less today ? Because some irregularities were lost through errors.
Old English, like many Germanic or even Indo-European languages is a heavily inflected language. How comes that Modern English is not ? Centuries of approximate grammatical rules observance have seen to its simplification.
In one word, what is grammatical today was possibly not yesterday and will probably not be anymore tomorrow.
That does not mean you have to write phonetically. That would actually take too much brainpower from the reader and, as you have experienced, bring about emotional reactions.
What I mean is that typos are a fact of life. I must confess I've produced more than my fair share of typos already in this forum and some people were kind enough to silently clean up the mess. With hindsight, reading their editions often makes me feel ashamed because some of my typos are indeed "unforgivable" (I could have noticed them), but on the other hand their corrections also allow me to progress because I wasn't suspecting most of the other ones. The only excuse I can find is that I was focusing on the meaning rather than the spelling. I can only swear to be more cautious next time and hopefully give them less work.
I wouldn't worry too much about the small proportion of people voicing their disapproval. They're probably too easily hurt and they still need to learn to get over imperfection.
Tolerance is not a favour you grant to others, it's a favour you do to yourself. Just because you cannot benefit from complementarity without accepting difference in the fist place. May be some people who interrupted their reading once they reached your typo were looking for some information that actually lied beyond that typo. They will never know. It's their choice. You've done your half of the job albeit imperfectly; it's up them to decide whether they are willing to do the other half, not necessarily perfectly either.
It reminds me of something they say here in Tunisia about tourists complaining too much
Sorry, Achmed, I'm desperate for some
water, but I don't want to ride till the
oasis: you're camel is too smelly !!!"
I wonder where this white bones we just passed came from !