Does "you should" sound rude
I was writing an email to remind my client to ignore the mistakes I made in the last one.And I put it like this,"you should ignore my last email due to some mistakes I made." Then my boss told me I should not have said YOU SHOULD to client 'cause they're not my subordinate.Though I still confused whether it sounds rude to say YOU SHOULD to someone,particularly in this context?
Many thanks in advance!!!!