In light of the changes in require mask usage what is the stance of gencon with indiviual gms requiring mask?  If I show up to a game and the gms tells me I have to leave unless I wear a mask what are my recourses?  

Putting on a mask and playing so you don't make other people feel uncomfortable.  A little self sacrifice is always a good trait in human beings.

If you don't think they are doing enough or you think they are doing too much and your own standards/expectations don't match their policy, then don't go or host events.

From the Event Host Policy:
GEN CON STAFF IS RESPONSIBLE FOR ENFORCING CONVENTION POLICIES Just like with badge requirements or other convention policies, event organizers and GMs should remind attendees about the rules they should follow but are not responsible for directly enforcing them with attendees. If a participant in any of your events refuses to follow convention policies, makes your staff or other participants uncomfortable, or puts anyone in any danger, immediately contact Gen Con staff and event team members to deal with the problem.

It goes on that a GM has a problematic player or security issue, to also bring over Gen Con staff.

note: the easiest solution to everyone's problem is to simply refund your ticket instead of 'forcing' the GM or player to interact.

My hope would be that GMs are not allowed to make their own rules on this matter, as the current policy clearly states that masks are optional if you have a proof-of-vaccination bracelet. Attendees, including GMs, should be aware of this and thus anticipate and consider their comfort level at being around people who are not wearing masks in advance. 

However, I agree that it would be nice to have an official statement confirming (or refuting) that a GM/EO cannot require someone with a proof-of-vax bracelet to wear a mask at their event/game.

Or you could insist on staying without a mask and probably have a bad time. Hope it's not a game where cooperation is required. Or you might find people unwilling to trade that wheat for sheep.

Have some common courtesy and everything will work out fine. 

And the fifth guy in your example is better off not playing in that game. Simple respect and going along with the majority seems the better option.

Let me clarify the above since you missed an important point:

 If a participant in any of your events refuses to follow convention policies, makes your staff or other participants uncomfortable, 

Sorry!

That starts happening, I'll just excuse myself, say 'Have fun guys' and see about getting a potential refund and finding something else to do during that time slot.

So can a dm claim they feel uncomfortable playing with a person not vaccinated even if they wear a mask by your rational?

Since you've said you aren't coming, maybe just let us do our thing without trying to throw a wrench in the gears. 

We will be fine, I assure you. 

Gen Con staff are competent and attendees are overwhelmingly reasonable. 

Way to deflect a legitimate question and reconfirming why I’m making the right decision to skip.  Thanks!

Again.  Read the policy, you keep reading new words into it.

The GM calls over staff to handle the issue, they do not actively 'boot' or 'kick' people...they leave that to others.  But once they do, granted, it is unlikely the GM and player want to play with each other and I suspect a refund coming.

The policy also notes if a player objects to the material and/or content of the game, the GM can note this on the back of the ticket (or send an email) and send the player to Customer Service to obtain a refund.