Grunching:

Just want to break this out for a second. I didn't read all the replies yet, but if no one has said this, you should try and table select a little bit better. If you don't have a different game / casino, that's one thing. But if you have other choices, you should try and find a different game. Even a 1/2 game will likely be +EV for you as compared to this OMC filled 2/5 game. Always be on the lookout for a good table / game / casino.

When rocks open, and I've got a premium, I like to 3bet here even more so.
They are playing very strong opening ranges. Ranges that they just don't like to fold. Also, we are not as likely to get money out of them post flop. 3bet, build this pot so that we can get fat value later.

Yes, 3 bet pre is standard in his spot. Flatting is not what I would even typically do here.

Muck: I don't know about qq or kk, like I said nothing is ever always by I would rather 3b pre qq. I would think I could get away from qq, but in actual play I'm not sure. Kk I would play identical. Those hand would both make life a little more difficult.

Against a OMC raising range, 3b with QQ here given images is really bad. It lets him get away cheaply with the bottom of his range and bloats the pot against the top of his range, against which QQ doesn't do too well. A 3b with AA makes a ton more sense, because you want to set up being able to stack his KK/QQ postflop (or AK if he flops toppest pair).

There's a good thread on here somewhere with details about constructing an appropriate 3-betting range, but one key principle is that you don't want to cannibalize the range of hands you can call with for value. In this case, your QQ does fine against his initial raising range, but not very well against the part of his range that continues to a 3b. Obviously in other spots with non-OMC villains, you will sometimes want QQ in your 3b range.

I only like a flat if someone in the blinds loved to squeeze or maybe if big blind was just so terrible that we don't want to blow him out of the pot. Otherwise we want to extract the most value out of OMC as possible preflop.