I make allowances for persons speaking in English as a second language making grammatical errors.

I make allowances for persons using Internet slang or shorthand like the u, 2, lol, imo, afik -- this is the common language of the Internet today. Also, some misspellings that would get past a spell check but notwithstanding simple grade school syntax errors.

That said, when people who should be schooled in English grammar make errors showing their 5th grade educations: I will say nothing however forming my opinion of their status in life accordingly.