If you really don't want to deal with Casual Players simply go to Matching Settings when you select the quest and you can check a box so you'll enter a room where Allies/NPCs aren't allowed. You're more likely to find players that are grinding for weapons there than when you select the area normally.
Even though it came out last week and it might not show up as part of the Recommended Quests, it'll still be considerate of you to treat Casual Players in the Bewtiched Woods with kid gloves and not be overly demanding or strict on these players when they start exploring these quests on Extremely Hard. This will be the time where a quest like this will be the first time these players encounter a quest that plays like the Ultimate Quests, especially if they never touch Ultimate Quests at all. Even though Tokyo and Las Vegas has Extremely Hard difficulties, they're not as tough as Bewitched Woods is going to be when players enter them for the first time and will find out the hard way the true difference between Super Hard and Extremely Hard enemies. But I feel like expert players will be even tougher on them than the enemies. What I propose that you do tomorrow when there's alot of players exploring these woods that haven't tried to do so because of a mission are these is to not block them for any of the following:
- Bringing NPCs/Bots to the area: there may be some people who feel comfortable and safer with them around than other players since they can distract enemies sometimes. Not to mention it's hard to find someone who has a similar playstyle as them or have different goals regarding the area. Also again, this may basically be their first time going through a quest that acts more like an Ultimate Quest rather than a normal quest.
- Not sticking with the "cycle" or whatever it's called: most of the casuals that come here are probably here to just complete area, not to grind out weapons. There may also be some players that would rather actually explore the area first before completing the level and sometimes that's best way to get the S-Rank.
- Dying too much: Again this is probably their first time running into an area that acts like an Ultimate Quest, especially if they're the type of player who would avoid this, but still want to level up. Tokyo's and Las Vegas' Extremely Hard doesn't help them ease into it.
- Having Auto Chat unrestricted or Auto Chat at all: A different kind of player but still could be casual, like the ones that like to explore, they have different ways of having fun. Some may say that's a better reason to get mad at them but I disagree, being considerate means respecting how other people play. The only time to get mad at them is if they're obnoxious or inappropriate about them.
So what should you do to tell them these things aren't normally welcome? Simply warn them once about that and only once, no need for everyone else around you to constantly chastise them about the way they're playing. If you really don't want to deal with casual players, like I wrote at the beginning, you can go to matching settings when you select the quest and enter a room where Allies/NPCs/Bots aren't allowed, that way you won't run into them at all. But if you want to help them learn about these things then there's a kinder way to go about this. Basically saying, "Next time don't bring the bots here," is a little better than saying "get rid of them, you're ruining it for everyone else."
The other way is to ignore them and revive them if you want to, but either way just let them play the game they want since I think most casual players don't even go to forums like this or even look up Youtube videos about what you should do in the area, which is why I'm asking you to be considerate and patient with them, at the very least for a month so they'll have enough time to learn. Also you may say that because they're level 75 they should've learned this stuff by now, but I think I can counter that you can level up really quickly in the game and the challenging stuff only just begun, so a chance of a casual player going into this mission like any other Exploration Mission is pretty high, because of the previous ones aren't that terribly difficult.