Most of the spider morphs I've run across in person or have seen on youtube are pretty docile snakes. Sometimes a bit antsy if they have a more pronounced wobble, but not nippy.
Personally tho, I do have a very nippy spider. But that's just luck of the draw. I've tried different setups since May and she's very fussy about her food. So far, nothing has helped, she will come rushing out to defend herself. With luck, she may mellow out as she gets closer to that 1000 gram weight, but she's still small and at around 350 grams. She's fasting a bit right now...So who knows when she'll actually get to that size.
But that can just be how some bps in general are. I had a similar experience with a young normal phase. Once he was eating well and got to a good size, he was fine.
Another 'nippy' bp of mine was a rescue normal with a severe burn, so he was just painful. Now he's mostly just a tad defensive, but I can't blame him after everything.
I had a rough time with blizzard morph leopard geckos back in 2005. They had a bit of a 'tude. They were the only leos I had where I would get bit. I'm assuming because at the time, they were probably not very diversified. Some of the original stock may have had more of a grumpy attitude. They were still the newest morphs at that time, so some people were still linebreeding to get visual blizzards as quick as possible. Blizzards now have had a chance to outcross and most I've seen are sweethearts now.
Spiders have had more than enough time to outcross, so I don't think it's anything like that, unless the spiders he was working with are pretty tightly linebred. And that's something you would want to avoid regardless. Linebreeding can help isolate some cool morphs, but can be detrimental after a while. Reptiles are far more forgiving than birds or mammals where issues crop up fairly quick and can be identified. Reptiles are slower at showing those lingering issues.
That being said... a nippy bp isn't necessarily a bad thing in a breeding group. Just if you notice a higher incidence of nippy descendents than normal, you may want to reconsider that project.
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