Having been inspired by a recent question here, here is another.
FIDE §E11.5 prohibits "unreasonable offers of a draw". Some specific cases which might get frowned upon by your opponent, even if perfectly legal by the rules:
- Repeated draw offers are a relatively easy case for the arbiter, since (which is the whole point of that rule) you have to mark them on your game sheet. (Rule of thumb: No repeat unless the position has changed significantly.)
- Draw offer in a worse position: I would recklessly offer a draw against a GM e.g. in KNN/KRN, since I only have to survive 50 moves, and >200 are needed for the win, so "standing worse" or "lost" is a nontrivial case.
- Finally, offering a draw against a much stronger player. I read about an actual case in a chess magazine (the stronger player did not complain to the arbiter, but to the public - a clear ?! move :-).
Please note that all these cases are judgmental, so don't bother to discuss where you would draw the line. They fall under the Preface catch-em-all "the laws can't rule everything, leave it to the tact of the arbiter". Thus, instead:
Can you link me to actual reports of such cases (chess magazines, websites), and how the arbiter ruled? (Since GM know the rules by heart...or so I hope..., I don't expect this to happen in a higher league. Also, you can always answer the frivolous offer silently by a move and a go-fly-a-kite face...)