I own several. They all have their own temperaments, though none are truly "aggressive". They all tolerate being handled, though most prefer to be left alone. My two largest females are actually the easiest to handle despite being the largest in the collection, but IMO that's because both came from backgrounds where their prior owners handled them a lot.
If you purchase from a breeder you can ask for a baby that tends to be chilled out rather than defensive.
For a really laid-back boa look into the Dumeril's.
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