let me guess why
I guess that IS one possibility, but maybe GrandeSande's motives were less sinister. I've seen other posters request that those of us for whom english is our first language provide input on the language's use by those for whom it is not. I know there are plenty of jerks out there who enjoy nothing more than shoving something down somebody else's throat (it tends to make "small" people feel better about themselves), but, unless you already have a history with this person, you may be doing yourself and them a disservice by assuming that's what they had in mind.
How do YOU feel about getting input on your use of english on this forum? Do you welcome it? How about other posters?