I'm not sure that's a high value-to-combativeness question, but I've known of some companies volunteering that they've only done clean term sheets ( vs https://carta.com/blog/watch-out-for-these-terms/ )

Whatever went into taking a down round or having to sign off on something worse than a 1x liquidation preference from a VC is bound to be a touchy subject so I'd word the question tactfully.