My friend swears that RAI, ALL cantrips can be…

My friend swears that RAI, ALL cantrips can be cast as a bonus action!

Please help! My friend swears that RAI, ALL cantrips can be cast as a bonus action, regardless of actual casting time.I tried telling him the rule is if you cast a spell using your BA,you can only cast a cantrip as your standard. Who has the right interpretation?No rule says any cantrip can be cast as a bonus action. — Jeremy Crawford (@JeremyECrawford) March 4, 2018