Can I be honest? I love spiders... I read about them and all... And this is ONE THING I HATE from ACNL... 1st of all, tarantulas would NEVER bite you just like they do in-game. Actually all spiders are sort of cowards, they'd rather run and hide than sting you and fight. Second, tarantulas bites are NOT poisonous in any way. (majority of them, lol) They rather scare you by looking threatening and make you go (and they'd run away too) than fight.
IDK... as a fan of spiders (and I have like 15 in my backyard and I just go and stay 1/2 hour watching them and stalk them with my magnifying glass, they seriously are cowards.
So... I wish ACNL (and all Nintendo's IPs) would stop scaring EVERYONE with spiders who, honestly, 95% of them are benevolent, awesome and scared of you. (It's like bats!)