Givers not waiting for the winners reply - formerly "Rude" givers

New Description for the easily offended (no, I don't mean you!):
There are people here feeling unhappy about some winners behaviour. But I think there are also some giveaway-creators whose behaviour could, in my humble opinion, be called impolite. I already made the experience that, after wining a giveaway, I couldn't contact the winner because as soon as the giveaway ended he or she did put me on his (or her) blacklist. That's just fine. It's each persons own choice to put someone on his (or her) personal blacklist. But this way it is not possible for me to show the giver my honest gratitude. That really makes me sad.

If you are a sissy, don't read any further (I warned you!):
There is so much rant here about winners who don't activate keys, don't say thanks or whatever. Maybe I was just lucky but I had no problems with that yet. But I already stumbled upon several users who did blacklist me after winning one of their giveaways without any explanation. Guys, that's just rude!!! Wait until I had the opportunity to say thanks for the gift or at least give an explanation why I was blacklisted. OK, it's your giveaway, so you can do as you like. But I do feel pissed off by this kind of behaviour!

Edit：
I did not create this thread because I feel insulted by being blacklisted. It's just the following situation:
Yippee, I won a game! Thanks man, I feel really grateful. Blacklisted WTF, I can't even reply to the giver.