Is Terastodon bracket 2?

I was playing a Bracket 2 on SpellTable and two opponents got hostile when I revealed a [[Terastodon]]. They claim it is “mass land destruction” and therefore banned in bracket 2.

The MLD rule on the Wizards site mentions 4 or more lands per player. Terastodon is not even 4 lands period.

Anyway, I silently decided they were stupid and I exiled my Terastodon and proceeded with the game. These players also think when I Polymorph their creature, and they sacrifice in response, now Polymorph has no valid target “but the spell keeps resolving and I get a creature”. I explain that a spell with no valid targets won’t resolve at all. They disagree. I silently note they are stupid and let them get a creature.

Is there a “feigning stupidity” kind of cheating that I’m not aware of?