There is at least one point I can agree with London non-"girl": You should be able to explain grammar points if you are asked, and you should not only be able to explain it, you should also know how to explain it.

Hahaha! what are grammar points, points awarded to students who use good grammar? Being serious now. You may very well agree with LG but I doubt she'll be agreeing with you any time soon. Has this last week been a dream, or has she or has she not been saying that the only thing you know about English Grammar is that it exists and it's pesky? Hasn't she comprehensibly shown us that you know far less, and are far less able in English Grammar than an uneducated native English speaker? Stop using names like Sweetheart when addressing LG please. Not only dismissively meant bur sexist in the context.