This is a fallacy and an excuse for poor behavior.
The reason tickle lovers (or foot lovers, they seem to get a lot of hate as well) are often considered creepy is because they act that way. It is very rare, in my experience, that people negatively judge someone for simply having a kink... unless their only experience with that kink is via someone expressing it in an unhealthy and boundary-crossing way.
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I really, really feel strongly about this. So much so that when a friend of mine "came out" to me about her tickling/foot/bondage predilections and found out that a place like this existed on the Internet, then asked me for the URL, I actually had to think about it for a few days. My initial thoughts on the subject were not, "Oh boy! Another member brought into the fold!". They were, "Son of a bitch. She's 19, and a model. Talk about raw meat to the wolves. I'm not letting her within ten IP addresses of this place."
A fallacy is a misconception resulting from incorrect reasoning.
A misconception an incorrect conception
A conception is an abstract or general idea inferred or derived from specific instances.
The sentence you quote:
“And never forget, that in mainstream everyday life we tickler lovers are very often consider "creepy".”
That is not a fallacy, because is not derived neither inferred. It does not involve reasoning. It simple reports an observation namely: that tickle lovers are very often consider “Creepy” in mainstream. It does not deduce or infer anything from the specific instances, it only report that instances have been observed, therefore is not a fallacy.
That it is an excuse for poor behavior, on the other hand, it actually a fallacy, because it is neither deduce or inferred from the sentence in question that the observation “ticklers lovers are often consider
Creepy” is an excuse for poor behavior or was even intended to be.
That is your subjective interpretation only. Legitimate, true, but subjective.
Now from the dictionary:
Creep: someone unpleasantly strange or eccentric
Creepy: annoying and unpleasant; "some creepy kids were bothering her"
To be strange is simple to be different, out of the ordinary. In that sense, all tickler lovers and ticklees are out of the ordinary, all a bunch of creeps.
To be unpleasantly strange (different) is subjective. My behavior may not be unpleasant for me, but can be intolerable to my neighbor. The only objective criteria I know to decide about says,
“If it is not forbidden by law, the you can engage on doing it” and even that criteria is not bulletproof. However in the case of child abuse and pornography the criteria I mention holds very well. And the moderators enforce it very well too. So overall I am happy with the self regulation of the TMF until now.
About the example you put; I will have a very different approach to the one you described. I would have told to the 19 years old, that is like a coin, on the good side there is a lot of people to share your tastes, on the other side it also has a sizable proportion of members that can not find anything better to do that persecute you in everyway they could think. Is a trade off. You will have to deal with them, reject them , ignore them, etc. Your are over 18 years old, choose.
My personal advice would have been lurk for a while, and then decide, to get in or not, since she is old enough not to be naive about human nature. And never give away any important data about yourself, as it is with all the web. Be prudent, walk with open eyes, protect your privacy, trust nobody.