Till death do us punch. A ritzy Manhattan wedding rehearsal dinner descended into a brawl after the groom’s parents objected to a toast on the eve of the couple’s $325,000 nuptials at The Pierre hotel, according to a lawsuit between warring would-be in-laws. At some point during the chaos, the seething bride gave her betrothed an ultimatum: “Make a choice, me or your mother,” according to a …