Unsurprisingly, I probably worded myself wrong. I don't have an issue with GMs calling the shots or having the final say in things pertaining to the RP. If they didn't, the RP would be about arguing and not about roleplaying. However, I do have an issue with the GMs who are proven wrong on certain--or many--points and then use their status as the owner of the roleplay as their go-to defense against these sorts of challenges. 

Honestly, the points Prince made about this sort of behavior pretty much cover what I'm trying to say.