that or which

Still unable to address the language issues, McTag.

What is wrong with you? After all, you were schooled by your parents and a raft of style manuals that sit unused on your bookshelf.

You profess to want discussion on "language issues", but your adopted style gives the lie to that.
Your spiteful, misanthropic posts besmirch the threads.

Still unable to address the language issues, McTag, tsk tsk tsk.

So you can do smarmy as well as nasty. No surprise.