It's definitely interesting to learn about the history behind the words we use. However words like these have long since lost their original meaning. I fail to see how it can perpetuate an assumption about the Vandals if most people don't even realize the word was originally referring to a group of people. Too much emphasis is placed these days on the words we use rather than the idea we're attempting to get across.
I understand that you feel a personal connection with the Vandals. But you can take comfort in the fact that nobody who uses that word in its current meaning is speaking ill of the Vandals as a people. And it gives you an opportunity to educate people about the history behind that word and the important lesson about hubris that we should learn from it. Because despite the negative connentation the word now has, wouldn't erasing the word from our language be another step towards forgetting about the Vandals and their history?