I gather this is mis-posted and actually directed to Dovetail but on your query, its obviously not just his "personal opinion" but well recognised that people mis-remember things from the past.

Its also the case that due to our need to maintain some degree of personal self esteem mis-remembering often has strong motivation.
People like to think well of themselves and that their actions are less selfish than they really are: a classic is found regularly in political polls where people surprisingly often misremember that they actually voted Tory in the last election.