I believe I'm correct in quoting 007 that you should never trust a man with a Windsor knot. Ha. "Bond mistrusted anyone who tied his tie with a Windsor Knot. It showed too much vanity. It was often the mark of a cad."

I first learned a half-Windsor at age 4 or 5 since I decided that only "little boys" wore clip on bow ties. My grandfather taught me, and I have never worn a clip on tie of any kind since.

I learned to use the full Windsor as an alternative as a boy--7-9 perhaps--as a means of shortening a longer tie. (I would sneak one of my dad's.) I also learned to match the collar to the knot and tie.

By age 14 or so, I learned that a four-in-hand was crooked, and I refused to wear one, but, getting taller, I learned:
1. a half-Windsor leaves the front longer
2. a wool tie is too thick for a full Windspr (usually)

In the USMC, I learned to tie the then very narrow wool tie in a four-in-hand and use the spring-loaded, one-piece collar stay to make the very small, tight knot stick almost straight out from the very tight collar on my wool dress shirt, and I came to appreciate a four-in-hand as a useful alternative for certain styles of dress, formal wear, etc.

I never heard of a Pratt knot until today--learn something every day!--and after investigating, I see that it is essentially an inside-out half Windsor. Pretty cool knot, though. I may try it out just for the heck of it.

So--back to your original question--I'm pretty sure that the knot has no connotatons these days. I use the half-Windsor mostly because a regular length tie it too short otherwise. With an extra-long tie (which is all I buy now), I can vary the knot by shifting the relative placement of the different ends before tying.

And that's a lot more than you cared to know.