Many years ago, I boarded a flight on AA to LAS. As I was going to my seat in F, I noticed a guy with a FT tag. I mentioned it to him and he like did everything he could to not acknowlege my question or even my existence.
As someone stated, why have the tags if you don't want to communicate with other FTers? This last weekend my FT tag was spotted at the RCC in SYD by another FT and I spotted one at the Arrivals lounge in SFO. Nice guys and had pleasant conversations with both.
I do believe, however - and this may be just my paranoia - that some people are not as friendly because I am a Mod in a particualr forum and have had make some unpopular decisions (unpopular to them). I hope that is not the case, but i guess we shall really see what happens in SFO in a few weeks.