I suspect that giving a name to a hypothesis can cause you to defend it but it might be able to do the opposite also if it is already a hypothesis you dislike. I suspect that it is more likely to move one's emotional attachment towards extremes rather than move one's attitude in any specific direction. I also suspect this is more likely to be a problem for extended hypotheses that are more networks of interlocking ideas than simple hypotheses (so e.g. NLP would be a name in this sense, but I suspect that "Rationalist Taboo" would be too simple to have much of an actual impact.)
Shorthand hypothesis names are generally helpful. I suspect that for most purposes naming hypotheses will provide more help (in terms of efficient communication and in terms of one's own mental shortcuts and processing) than it will harm.
I think the problem is not just giving hypotheses names, but giving large collections of hypotheses names. It bundles them together so that the strongest hypotheses in the group can defend the weakest ones, or the weakest ones can damage the strongest ones, even if the different hypotheses aren't actually related in a technical sense.
Dividing hypotheses into "NLP" and "not-NLP" is an attempt to carve hypothesis-space at its natural joints, and therefore needs to be justified by clear shared dependencies among those hypotheses.
I just heard a comment by Braddock of Lovesystems that was brilliant: All that your brain does when you ask it a question is hit "search" and return the first hit it finds. So be careful how you phrase your question.
Say you just arrived at work, and realized you once again left your security pass at home. You ask yourself, "Why do I keep forgetting my security pass?"
If you believe you are a rational agent, you might think that you pass that question to your brain, and it parses it into its constituent parts and builds a query like
X such that cause(X, forget(me, securityPass))
and queries its knowledge base using logical inference for causal explanations specifically relevant to you and your security pass.
But you are not rational, and your brain is lazy; and as soon as you phrase your question and pass it on to your subconscious, your brain just Googles itself with a query like
why people forget things
looks at the first few hits it comes across, maybe finds their most-general unifier, checks that it's a syntactically valid answer to the question, and responds with,
"Because you are a moron."
Your inner Google has provided a plausible answer to the question, and it sits back, satisfied that it's done its job.
If you instead ask your brain something more specific, such as, "What can I do to help me remember my security pass tomorrow?", thus requiring its answer to refer to you and actions to remember things and tomorrow, your brain may come up with something useful, such as, "Set up a reminder now that will notify you tomorrow morning by cell phone to bring your security pass."
So, try to be at least as careful when asking questions of your brain, as when asking them of Google.