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But it sure showed the power of aggression or stupidity.

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Sorry but I disagree with the others who suggest putting it in the past and moving on.

Something like this is symptomatic of a bigger problem in concentration (or lack thereof), as well as problems in your thought methodology during the hand. You saw a set of Sixes and figured they were automatically good. Sounds like you may not have considered that the opponent may have had a set of Tens. Had you thought about it a little more, possibly you would have relooked at your hand and noticed the error earlier.

You pissed away what, about 4 or 5 big bets. That's an hour of expectation gone. Actually more like two, because you have to win it back and then some to make up.

Better to multi-table only 2 tables and make zero errors with sound thought methodology, than multi-table 4x and make this or similar error one time per session, and not be properly thinking the hands through.