My guess -- Fifth amendment is: he (generic third-person "he") refuses to answer because it might incriminate him. FR Fifth amendment is: he won't say it plainly because the post might be deleted (or worse). Remarks about undesirable weather conditions seem to refer to the same thing. But he still wants to make broad hints about it, for some reason.
I think that whatever animosity "he" may harbor, he should just let it go.
I'll give you a clue. Check out my original weather report, above.