policy that would not allow single game resales and tried to force everyone to buy a season ticket. That was to try to prevent their own stadium from being overran by BYU fans for BYU game and from being overran by Texas fans for Texas game. I don't remember how that worked out in practice.
But last BYU-Baylor game at Baylor there were pockets of BYU fans all over the stadium. So no I don't think there is anything to what you are worried about for the Baylor game, at least from a Baylor institutional level. Whether any specific Baylor fans would give you grief for being in their section, I can't guarantee you that one way or another.